diff --git a/drust/src/main.rs b/drust/src/main.rs
index 2314c934..87973883 100644
--- a/drust/src/main.rs
+++ b/drust/src/main.rs
@@ -1,9 +1,8 @@
 use pagetop::prelude::*;
 
+#[derive(AssignHandle)]
 struct Drust;
 
-impl_handle!(APP_DRUST for Drust);
-
 impl ModuleTrait for Drust {
     fn dependencies(&self) -> Vec<ModuleRef> {
         vec![
diff --git a/examples/basics/hello-name/src/main.rs b/examples/basics/hello-name/src/main.rs
index cf216f1f..e248d7ff 100644
--- a/examples/basics/hello-name/src/main.rs
+++ b/examples/basics/hello-name/src/main.rs
@@ -1,9 +1,8 @@
 use pagetop::prelude::*;
 
+#[derive(AssignHandle)]
 struct HelloName;
 
-impl_handle!(APP_HELLO_NAME for HelloName);
-
 impl ModuleTrait for HelloName {
     fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
         scfg.service(hello_name);
diff --git a/examples/basics/hello-world/src/main.rs b/examples/basics/hello-world/src/main.rs
index 516bade2..95b28647 100644
--- a/examples/basics/hello-world/src/main.rs
+++ b/examples/basics/hello-world/src/main.rs
@@ -1,9 +1,8 @@
 use pagetop::prelude::*;
 
+#[derive(AssignHandle)]
 struct HelloWorld;
 
-impl_handle!(APP_HELLO_WORLD for HelloWorld);
-
 impl ModuleTrait for HelloWorld {
     fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
         scfg.route("/", service::web::get().to(hello_world));
diff --git a/pagetop-admin/src/lib.rs b/pagetop-admin/src/lib.rs
index db70f468..acf69fa6 100644
--- a/pagetop-admin/src/lib.rs
+++ b/pagetop-admin/src/lib.rs
@@ -4,10 +4,9 @@ static_locales!(LOCALES_ADMIN);
 
 mod summary;
 
+#[derive(AssignHandle)]
 pub struct Admin;
 
-impl_handle!(MODULE_ADMIN for Admin);
-
 impl ModuleTrait for Admin {
     fn name(&self) -> L10n {
         L10n::t("module_name", &LOCALES_ADMIN)
diff --git a/pagetop-bootsier/src/lib.rs b/pagetop-bootsier/src/lib.rs
index 7a45a904..52c52e4b 100644
--- a/pagetop-bootsier/src/lib.rs
+++ b/pagetop-bootsier/src/lib.rs
@@ -4,10 +4,9 @@ static_locales!(LOCALES_BOOTSIER);
 
 static_files!(bootsier);
 
+#[derive(AssignHandle)]
 pub struct Bootsier;
 
-impl_handle!(THEME_BOOTSIER for Bootsier);
-
 impl ModuleTrait for Bootsier {
     fn theme(&self) -> Option<ThemeRef> {
         Some(&Bootsier)
@@ -83,7 +82,7 @@ impl ThemeTrait for Bootsier {
 
     fn before_prepare_component(&self, component: &mut dyn ComponentTrait, _cx: &mut Context) {
         match component.handle() {
-            COMPONENT_BASE_ICON => {
+            h if Icon::matches_handle(h) => {
                 if let Some(i) = component_as_mut::<Icon>(component) {
                     match i.font_size() {
                         FontSize::ExtraLarge => {
@@ -105,7 +104,7 @@ impl ThemeTrait for Bootsier {
                     };
                 }
             }
-            COMPONENT_BASE_BUTTON => {
+            h if Button::matches_handle(h) => {
                 if let Some(b) = component_as_mut::<Button>(component) {
                     match b.font_size() {
                         FontSize::ExtraLarge => {
@@ -135,7 +134,7 @@ impl ThemeTrait for Bootsier {
                     };
                 }
             }
-            COMPONENT_BASE_HEADING => {
+            h if Heading::matches_handle(h) => {
                 if let Some(h) = component_as_mut::<Heading>(component) {
                     match h.display() {
                         HeadingDisplay::ExtraLarge => {
@@ -157,7 +156,7 @@ impl ThemeTrait for Bootsier {
                     };
                 }
             }
-            COMPONENT_BASE_PARAGRAPH => {
+            h if Paragraph::matches_handle(h) => {
                 if let Some(p) = component_as_mut::<Paragraph>(component) {
                     match p.font_size() {
                         FontSize::ExtraLarge => {
@@ -185,7 +184,7 @@ impl ThemeTrait for Bootsier {
 
     fn render_component(&self, component: &dyn ComponentTrait, cx: &mut Context) -> Option<Markup> {
         match component.handle() {
-            ERROR_404 => Some(html! {
+            h if Error404::matches_handle(h) => Some(html! {
                 div class="jumbotron" {
                     div class="media" {
                         img
diff --git a/pagetop-bulmix/src/lib.rs b/pagetop-bulmix/src/lib.rs
index 6dfe5856..123facc9 100644
--- a/pagetop-bulmix/src/lib.rs
+++ b/pagetop-bulmix/src/lib.rs
@@ -2,10 +2,9 @@ use pagetop::prelude::*;
 
 static_files!(bulmix);
 
+#[derive(AssignHandle)]
 pub struct Bulmix;
 
-impl_handle!(THEME_BULMIX for Bulmix);
-
 impl ModuleTrait for Bulmix {
     fn theme(&self) -> Option<ThemeRef> {
         Some(&Bulmix)
@@ -32,7 +31,7 @@ impl ThemeTrait for Bulmix {
 
     fn before_prepare_component(&self, component: &mut dyn ComponentTrait, _cx: &mut Context) {
         match component.handle() {
-            COMPONENT_BASE_ICON => {
+            h if Icon::matches_handle(h) => {
                 if let Some(i) = component_as_mut::<Icon>(component) {
                     match i.font_size() {
                         FontSize::ExtraLarge => {
@@ -54,7 +53,7 @@ impl ThemeTrait for Bulmix {
                     };
                 }
             }
-            COMPONENT_BASE_BUTTON => {
+            h if Button::matches_handle(h) => {
                 if let Some(b) = component_as_mut::<Button>(component) {
                     match b.font_size() {
                         FontSize::ExtraLarge => {
@@ -84,7 +83,7 @@ impl ThemeTrait for Bulmix {
                     };
                 }
             }
-            COMPONENT_BASE_HEADING => {
+            h if Heading::matches_handle(h) => {
                 if let Some(h) = component_as_mut::<Heading>(component) {
                     match h.display() {
                         HeadingDisplay::Subtitle => {
@@ -94,7 +93,7 @@ impl ThemeTrait for Bulmix {
                     };
                 }
             }
-            COMPONENT_BASE_PARAGRAPH => {
+            h if Paragraph::matches_handle(h) => {
                 if let Some(p) = component_as_mut::<Paragraph>(component) {
                     p.add_classes("block");
                     match p.font_size() {
@@ -127,7 +126,7 @@ impl ThemeTrait for Bulmix {
         _cx: &mut Context,
     ) -> Option<Markup> {
         match component.handle() {
-            COMPONENT_BASE_ICON => {
+            h if Icon::matches_handle(h) => {
                 if let Some(i) = component_as_ref::<Icon>(component) {
                     return match i.icon_name().get() {
                         None => None,
diff --git a/pagetop-homedemo/src/lib.rs b/pagetop-homedemo/src/lib.rs
index 849d0d56..71ff5294 100644
--- a/pagetop-homedemo/src/lib.rs
+++ b/pagetop-homedemo/src/lib.rs
@@ -4,10 +4,9 @@ static_locales!(LOCALES_HOMEDEMO);
 
 static_files!(homedemo);
 
+#[derive(AssignHandle)]
 pub struct HomeDemo;
 
-impl_handle!(MODULE_HOMEDEMO for HomeDemo);
-
 impl ModuleTrait for HomeDemo {
     fn name(&self) -> L10n {
         L10n::t("module_name", &LOCALES_HOMEDEMO)
diff --git a/pagetop-macros/src/lib.rs b/pagetop-macros/src/lib.rs
index cf7e1d6e..8fc88251 100644
--- a/pagetop-macros/src/lib.rs
+++ b/pagetop-macros/src/lib.rs
@@ -2,9 +2,10 @@ mod maud;
 
 use concat_string::concat_string;
 use proc_macro::TokenStream;
+use proc_macro2::TokenStream as TokenStream2;
 use proc_macro_error::proc_macro_error;
-use quote::{quote, quote_spanned, ToTokens};
-use syn::{parse_macro_input, parse_str, ItemFn};
+use quote::{format_ident, quote, quote_spanned, ToTokens};
+use syn::{parse_macro_input, parse_str, DeriveInput, ItemFn};
 
 #[proc_macro]
 #[proc_macro_error]
@@ -100,3 +101,66 @@ pub fn test(_: TokenStream, item: TokenStream) -> TokenStream {
     output.extend(item);
     output
 }
+
+#[proc_macro_derive(ComponentClasses)]
+pub fn component_classes_derive(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    let name = &input.ident;
+
+    let expanded = quote! {
+        impl ComponentClasses for #name {
+            fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
+                self.classes.alter_value(op, classes);
+                self
+            }
+
+            fn classes(&self) -> &OptionClasses {
+                &self.classes
+            }
+        }
+    };
+
+    TokenStream::from(expanded)
+}
+
+#[proc_macro_derive(CrateHandle, attributes(handle))]
+pub fn crate_handle_derive(input: TokenStream) -> TokenStream {
+    impl_handle(input, quote! { crate })
+}
+
+#[proc_macro_derive(AssignHandle, attributes(handle))]
+pub fn assign_handle_derive(input: TokenStream) -> TokenStream {
+    impl_handle(input, quote! { pagetop })
+}
+
+fn impl_handle(input: TokenStream, crate_name: TokenStream2) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+
+    let name = &input.ident;
+    let handle_name = format_ident!("HANDLE_{}", name.to_string().to_uppercase());
+
+    let expanded = quote! {
+        const #handle_name: #crate_name::Handle =
+            #crate_name::util::handle(module_path!(), file!(), line!(), column!());
+
+        impl #impl_generics #crate_name::ImplementHandle for #name #ty_generics #where_clause {
+            #[inline]
+            fn static_handle() -> #crate_name::Handle {
+                #handle_name
+            }
+
+            #[inline]
+            fn matches_handle(is: #crate_name::Handle) -> bool {
+                is == #handle_name
+            }
+
+            #[inline]
+            fn handle(&self) -> #crate_name::Handle {
+                #handle_name
+            }
+        }
+    };
+
+    TokenStream::from(expanded)
+}
diff --git a/pagetop-node/src/lib.rs b/pagetop-node/src/lib.rs
index 1a58b9f8..9201f5d8 100644
--- a/pagetop-node/src/lib.rs
+++ b/pagetop-node/src/lib.rs
@@ -5,10 +5,9 @@ static_locales!(LOCALES_NODE);
 //mod entity;
 mod migration;
 
+#[derive(AssignHandle)]
 pub struct Node;
 
-impl_handle!(MODULE_NODE for Node);
-
 impl ModuleTrait for Node {
     fn name(&self) -> L10n {
         L10n::t("module_name", &LOCALES_NODE)
diff --git a/pagetop-user/src/lib.rs b/pagetop-user/src/lib.rs
index 749ee99e..ba308b38 100644
--- a/pagetop-user/src/lib.rs
+++ b/pagetop-user/src/lib.rs
@@ -4,10 +4,9 @@ static_locales!(LOCALES_USER);
 
 mod migration;
 
+#[derive(AssignHandle)]
 pub struct User;
 
-impl_handle!(MODULE_USER for User);
-
 impl ModuleTrait for User {
     fn name(&self) -> L10n {
         L10n::t("module_name", &LOCALES_USER)
diff --git a/pagetop/src/base/action/component/after_prepare_component.rs b/pagetop/src/base/action/component/after_prepare_component.rs
index 088ceb20..479cd123 100644
--- a/pagetop/src/base/action/component/after_prepare_component.rs
+++ b/pagetop/src/base/action/component/after_prepare_component.rs
@@ -1,7 +1,9 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::FnAction;
 
+#[derive(CrateHandle)]
 pub struct AfterPrepareComponent<C: ComponentTrait> {
     f: FnAction<C>,
     referer_handle: Option<Handle>,
@@ -9,8 +11,6 @@ pub struct AfterPrepareComponent<C: ComponentTrait> {
     weight: Weight,
 }
 
-impl_handle!(ACTION_AFTER_PREPARE_COMPONENT for AfterPrepareComponent<ComponentTrait>);
-
 impl<C: ComponentTrait> ActionTrait for AfterPrepareComponent<C> {
     fn referer_handle(&self) -> Option<Handle> {
         self.referer_handle
diff --git a/pagetop/src/base/action/component/before_prepare_component.rs b/pagetop/src/base/action/component/before_prepare_component.rs
index 1bfd3d3e..d81fe2d6 100644
--- a/pagetop/src/base/action/component/before_prepare_component.rs
+++ b/pagetop/src/base/action/component/before_prepare_component.rs
@@ -1,7 +1,9 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::FnAction;
 
+#[derive(CrateHandle)]
 pub struct BeforePrepareComponent<C: ComponentTrait> {
     f: FnAction<C>,
     referer_handle: Option<Handle>,
@@ -9,8 +11,6 @@ pub struct BeforePrepareComponent<C: ComponentTrait> {
     weight: Weight,
 }
 
-impl_handle!(ACTION_BEFORE_PREPARE_COMPONENT for BeforePrepareComponent<ComponentTrait>);
-
 impl<C: ComponentTrait> ActionTrait for BeforePrepareComponent<C> {
     fn referer_handle(&self) -> Option<Handle> {
         self.referer_handle
diff --git a/pagetop/src/base/action/page/after_prepare_body.rs b/pagetop/src/base/action/page/after_prepare_body.rs
index d8bf98d7..78bcf391 100644
--- a/pagetop/src/base/action/page/after_prepare_body.rs
+++ b/pagetop/src/base/action/page/after_prepare_body.rs
@@ -1,14 +1,14 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::FnActionPage;
 
+#[derive(CrateHandle)]
 pub struct AfterPrepareBody {
     f: FnActionPage,
     weight: Weight,
 }
 
-impl_handle!(ACTION_AFTER_PREPARE_BODY for AfterPrepareBody);
-
 impl ActionTrait for AfterPrepareBody {
     fn weight(&self) -> Weight {
         self.weight
diff --git a/pagetop/src/base/action/page/before_prepare_body.rs b/pagetop/src/base/action/page/before_prepare_body.rs
index 4258f7ae..b2f94c39 100644
--- a/pagetop/src/base/action/page/before_prepare_body.rs
+++ b/pagetop/src/base/action/page/before_prepare_body.rs
@@ -1,14 +1,14 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::FnActionPage;
 
+#[derive(CrateHandle)]
 pub struct BeforePrepareBody {
     f: FnActionPage,
     weight: Weight,
 }
 
-impl_handle!(ACTION_BEFORE_PREPARE_BODY for BeforePrepareBody);
-
 impl ActionTrait for BeforePrepareBody {
     fn weight(&self) -> Weight {
         self.weight
diff --git a/pagetop/src/base/component.rs b/pagetop/src/base/component.rs
index 2064d0b4..23048e55 100644
--- a/pagetop/src/base/component.rs
+++ b/pagetop/src/base/component.rs
@@ -124,35 +124,35 @@ impl ToString for FontSize {
 // *************************************************************************************************
 
 mod html;
-pub use html::{Html, COMPONENT_BASE_HTML};
+pub use html::Html;
 
 mod translate;
-pub use translate::{Translate, COMPONENT_BASE_TRANSLATE};
+pub use translate::Translate;
 
 mod wrapper;
-pub use wrapper::{Wrapper, WrapperType, COMPONENT_BASE_WRAPPER};
+pub use wrapper::{Wrapper, WrapperType};
 
 pub mod flex;
 
 mod icon;
-pub use icon::{Icon, COMPONENT_BASE_ICON};
+pub use icon::Icon;
 mod heading;
-pub use heading::{Heading, HeadingDisplay, HeadingType, COMPONENT_BASE_HEADING};
+pub use heading::{Heading, HeadingDisplay, HeadingType};
 mod paragraph;
-pub use paragraph::{Paragraph, COMPONENT_BASE_PARAGRAPH};
+pub use paragraph::Paragraph;
 mod button;
-pub use button::{Button, ButtonTarget, ButtonType, COMPONENT_BASE_BUTTON};
+pub use button::{Button, ButtonTarget, ButtonType};
 mod image;
-pub use image::{Image, ImageSize, COMPONENT_BASE_IMAGE};
+pub use image::{Image, ImageSize};
 mod block;
-pub use block::{Block, COMPONENT_BASE_BLOCK};
+pub use block::Block;
 mod branding;
-pub use branding::{Branding, COMPONENT_BASE_BRANDING};
+pub use branding::Branding;
 mod powered_by;
-pub use powered_by::{PoweredBy, PoweredByLogo, COMPONENT_BASE_POWEREDBY};
+pub use powered_by::{PoweredBy, PoweredByLogo};
 
 pub mod menu;
-pub use menu::{Menu, COMPONENT_BASE_MENU};
+pub use menu::Menu;
 
 pub mod form;
-pub use form::{Form, FormMethod, COMPONENT_BASE_FORM};
+pub use form::{Form, FormMethod};
diff --git a/pagetop/src/base/component/block.rs b/pagetop/src/base/component/block.rs
index f4468854..4c1e409a 100644
--- a/pagetop/src/base/component/block.rs
+++ b/pagetop/src/base/component/block.rs
@@ -1,7 +1,8 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Block {
     id        : OptionId,
     weight    : Weight,
@@ -11,8 +12,6 @@ pub struct Block {
     stuff     : AnyComponents,
 }
 
-impl_handle!(COMPONENT_BASE_BLOCK for Block);
-
 impl ComponentTrait for Block {
     fn new() -> Self {
         Block::default()
@@ -51,17 +50,6 @@ impl ComponentTrait for Block {
     }
 }
 
-impl ComponentClasses for Block {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Block {
     // Block BUILDER.
 
diff --git a/pagetop/src/base/component/branding.rs b/pagetop/src/base/component/branding.rs
index 7fb6d664..221a2f3d 100644
--- a/pagetop/src/base/component/branding.rs
+++ b/pagetop/src/base/component/branding.rs
@@ -1,7 +1,8 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Branding {
     id        : OptionId,
     weight    : Weight,
@@ -14,8 +15,6 @@ pub struct Branding {
     frontpage : FnContextualPath,
 }
 
-impl_handle!(COMPONENT_BASE_BRANDING for Branding);
-
 impl ComponentTrait for Branding {
     fn new() -> Self {
         Branding::default()
diff --git a/pagetop/src/base/component/button.rs b/pagetop/src/base/component/button.rs
index e5ccbced..3f43f21d 100644
--- a/pagetop/src/base/component/button.rs
+++ b/pagetop/src/base/component/button.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[derive(SmartDefault)]
 pub enum ButtonType {
@@ -28,7 +29,7 @@ pub enum ButtonTarget {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Button {
     id         : OptionId,
     weight     : Weight,
@@ -43,8 +44,6 @@ pub struct Button {
     target     : ButtonTarget,
 }
 
-impl_handle!(COMPONENT_BASE_BUTTON for Button);
-
 impl ComponentTrait for Button {
     fn new() -> Self {
         Button::default()
@@ -92,17 +91,6 @@ impl ComponentTrait for Button {
     }
 }
 
-impl ComponentClasses for Button {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Button {
     pub fn link(href: impl Into<String>, html: L10n) -> Self {
         Button::default()
diff --git a/pagetop/src/base/component/flex.rs b/pagetop/src/base/component/flex.rs
index 29bed8ec..66e0daad 100644
--- a/pagetop/src/base/component/flex.rs
+++ b/pagetop/src/base/component/flex.rs
@@ -1,7 +1,7 @@
 mod container;
-pub use container::{Container, COMPONENT_BASE_FLEX_CONTAINER};
+pub use container::Container;
 mod item;
-pub use item::{Item, COMPONENT_BASE_FLEX_ITEM};
+pub use item::Item;
 
 use crate::prelude::*;
 
diff --git a/pagetop/src/base/component/flex/container.rs b/pagetop/src/base/component/flex/container.rs
index f578dfcf..d2f5fb7c 100644
--- a/pagetop/src/base/component/flex/container.rs
+++ b/pagetop/src/base/component/flex/container.rs
@@ -1,7 +1,8 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Container {
     id             : OptionId,
     weight         : Weight,
@@ -15,8 +16,6 @@ pub struct Container {
     gap            : flex::Gap,
 }
 
-impl_handle!(COMPONENT_BASE_FLEX_CONTAINER for Container);
-
 impl ComponentTrait for Container {
     fn new() -> Self {
         Container::default()
@@ -62,17 +61,6 @@ impl ComponentTrait for Container {
     }
 }
 
-impl ComponentClasses for Container {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Container {
     // Container BUILDER.
 
diff --git a/pagetop/src/base/component/flex/item.rs b/pagetop/src/base/component/flex/item.rs
index 6df8e0d6..3d1ea0d4 100644
--- a/pagetop/src/base/component/flex/item.rs
+++ b/pagetop/src/base/component/flex/item.rs
@@ -1,12 +1,13 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Item {
     id           : OptionId,
     weight       : Weight,
     renderable   : Renderable,
-    item_classes : OptionClasses,
+    classes      : OptionClasses,
     inner_classes: OptionClasses,
     item_grow    : flex::ItemGrow,
     item_shrink  : flex::ItemShrink,
@@ -16,8 +17,6 @@ pub struct Item {
     stuff        : AnyComponents,
 }
 
-impl_handle!(COMPONENT_BASE_FLEX_ITEM for Item);
-
 impl ComponentTrait for Item {
     fn new() -> Self {
         Item::default()
@@ -66,17 +65,6 @@ impl ComponentTrait for Item {
     }
 }
 
-impl ComponentClasses for Item {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.item_classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.item_classes
-    }
-}
-
 impl Item {
     // Item BUILDER.
 
diff --git a/pagetop/src/base/component/form.rs b/pagetop/src/base/component/form.rs
index f77f6b68..04f882cc 100644
--- a/pagetop/src/base/component/form.rs
+++ b/pagetop/src/base/component/form.rs
@@ -1,11 +1,11 @@
 mod form_main;
-pub use form_main::{Form, FormMethod, COMPONENT_BASE_FORM};
+pub use form_main::{Form, FormMethod};
 
 mod input;
-pub use input::{Input, InputType, COMPONENT_BASE_INPUT};
+pub use input::{Input, InputType};
 mod hidden;
-pub use hidden::{Hidden, COMPONENT_BASE_HIDDEN};
+pub use hidden::Hidden;
 mod date;
-pub use date::{Date, COMPONENT_BASE_DATE};
+pub use date::Date;
 mod button;
-pub use button::{Button, ButtonType, COMPONENT_BASE_BUTTON};
+pub use button::{Button, ButtonType};
diff --git a/pagetop/src/base/component/form/button.rs b/pagetop/src/base/component/form/button.rs
index e0df5e88..d88dd19b 100644
--- a/pagetop/src/base/component/form/button.rs
+++ b/pagetop/src/base/component/form/button.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[derive(SmartDefault)]
 pub enum ButtonType {
@@ -20,7 +21,7 @@ impl ToString for ButtonType {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Button {
     weight     : Weight,
     renderable : Renderable,
@@ -33,8 +34,6 @@ pub struct Button {
     template   : String,
 }
 
-impl_handle!(COMPONENT_BASE_BUTTON for Button);
-
 impl ComponentTrait for Button {
     fn new() -> Self {
         Button::default()
@@ -73,17 +72,6 @@ impl ComponentTrait for Button {
     }
 }
 
-impl ComponentClasses for Button {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Button {
     pub fn with(value: L10n) -> Self {
         Button::default().with_value(value)
diff --git a/pagetop/src/base/component/form/date.rs b/pagetop/src/base/component/form/date.rs
index 07e99b96..fbadfe15 100644
--- a/pagetop/src/base/component/form/date.rs
+++ b/pagetop/src/base/component/form/date.rs
@@ -1,7 +1,8 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Date {
     weight      : Weight,
     renderable  : Renderable,
@@ -19,8 +20,6 @@ pub struct Date {
     template    : String,
 }
 
-impl_handle!(COMPONENT_BASE_DATE for Date);
-
 impl ComponentTrait for Date {
     fn new() -> Self {
         Date::default().with_classes(ClassesOp::Add, "form-item form-type-date")
@@ -68,17 +67,6 @@ impl ComponentTrait for Date {
     }
 }
 
-impl ComponentClasses for Date {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Date {
     // Date BUILDER.
 
diff --git a/pagetop/src/base/component/form/form_main.rs b/pagetop/src/base/component/form/form_main.rs
index 0abdd438..7e7747b6 100644
--- a/pagetop/src/base/component/form/form_main.rs
+++ b/pagetop/src/base/component/form/form_main.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[derive(SmartDefault)]
 pub enum FormMethod {
@@ -8,7 +9,7 @@ pub enum FormMethod {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Form {
     id        : OptionId,
     weight    : Weight,
@@ -21,8 +22,6 @@ pub struct Form {
     template  : String,
 }
 
-impl_handle!(COMPONENT_BASE_FORM for Form);
-
 impl ComponentTrait for Form {
     fn new() -> Self {
         Form::default()
@@ -61,17 +60,6 @@ impl ComponentTrait for Form {
     }
 }
 
-impl ComponentClasses for Form {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Form {
     // Form BUILDER.
 
diff --git a/pagetop/src/base/component/form/hidden.rs b/pagetop/src/base/component/form/hidden.rs
index f774317c..9ed4ef6d 100644
--- a/pagetop/src/base/component/form/hidden.rs
+++ b/pagetop/src/base/component/form/hidden.rs
@@ -1,15 +1,14 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Hidden {
     weight: Weight,
     name  : OptionName,
     value : OptionString,
 }
 
-impl_handle!(COMPONENT_BASE_HIDDEN for Hidden);
-
 impl ComponentTrait for Hidden {
     fn new() -> Self {
         Hidden::default()
diff --git a/pagetop/src/base/component/form/input.rs b/pagetop/src/base/component/form/input.rs
index 80b8eb2f..0b62d969 100644
--- a/pagetop/src/base/component/form/input.rs
+++ b/pagetop/src/base/component/form/input.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[derive(SmartDefault)]
 pub enum InputType {
@@ -12,7 +13,7 @@ pub enum InputType {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Input {
     weight      : Weight,
     renderable  : Renderable,
@@ -34,8 +35,6 @@ pub struct Input {
     template    : String,
 }
 
-impl_handle!(COMPONENT_BASE_INPUT for Input);
-
 impl ComponentTrait for Input {
     fn new() -> Self {
         Input::default()
@@ -98,17 +97,6 @@ impl ComponentTrait for Input {
     }
 }
 
-impl ComponentClasses for Input {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Input {
     pub fn textfield() -> Self {
         Input::default()
diff --git a/pagetop/src/base/component/heading.rs b/pagetop/src/base/component/heading.rs
index 83bedc97..8b969f52 100644
--- a/pagetop/src/base/component/heading.rs
+++ b/pagetop/src/base/component/heading.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[derive(SmartDefault)]
 pub enum HeadingType {
@@ -39,7 +40,7 @@ impl ToString for HeadingDisplay {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Heading {
     id          : OptionId,
     weight      : Weight,
@@ -50,8 +51,6 @@ pub struct Heading {
     display     : HeadingDisplay,
 }
 
-impl_handle!(COMPONENT_BASE_HEADING for Heading);
-
 impl ComponentTrait for Heading {
     fn new() -> Self {
         Heading::default()
@@ -89,17 +88,6 @@ impl ComponentTrait for Heading {
     }
 }
 
-impl ComponentClasses for Heading {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Heading {
     pub fn h1(text: L10n) -> Self {
         Heading::default()
diff --git a/pagetop/src/base/component/html.rs b/pagetop/src/base/component/html.rs
index 0d7e04f8..8477ca5e 100644
--- a/pagetop/src/base/component/html.rs
+++ b/pagetop/src/base/component/html.rs
@@ -1,10 +1,9 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Html(Markup);
 
-impl_handle!(COMPONENT_BASE_HTML for Html);
-
 impl ComponentTrait for Html {
     fn new() -> Self {
         Html::default()
diff --git a/pagetop/src/base/component/icon.rs b/pagetop/src/base/component/icon.rs
index 4aabe923..9a945185 100644
--- a/pagetop/src/base/component/icon.rs
+++ b/pagetop/src/base/component/icon.rs
@@ -1,7 +1,8 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Icon {
     weight    : Weight,
     renderable: Renderable,
@@ -10,8 +11,6 @@ pub struct Icon {
     font_size : FontSize,
 }
 
-impl_handle!(COMPONENT_BASE_ICON for Icon);
-
 impl ComponentTrait for Icon {
     fn new() -> Self {
         Icon::default()
@@ -43,17 +42,6 @@ impl ComponentTrait for Icon {
     }
 }
 
-impl ComponentClasses for Icon {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Icon {
     pub fn with(icon_name: impl Into<String>) -> Self {
         Icon::default().with_icon_name(icon_name)
diff --git a/pagetop/src/base/component/image.rs b/pagetop/src/base/component/image.rs
index f4841b8f..67657b02 100644
--- a/pagetop/src/base/component/image.rs
+++ b/pagetop/src/base/component/image.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 const IMG_FLUID: &str = "pt-img__fluid";
 const IMG_FIXED: &str = "pt-img__fixed";
@@ -14,7 +15,7 @@ pub enum ImageSize {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Image {
     id        : OptionId,
     weight    : Weight,
@@ -24,8 +25,6 @@ pub struct Image {
     size      : ImageSize,
 }
 
-impl_handle!(COMPONENT_BASE_IMAGE for Image);
-
 impl ComponentTrait for Image {
     fn new() -> Self {
         Image::default().with_classes(ClassesOp::Add, IMG_FLUID)
@@ -62,17 +61,6 @@ impl ComponentTrait for Image {
     }
 }
 
-impl ComponentClasses for Image {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Image {
     pub fn with(source: &str) -> Self {
         Image::default()
diff --git a/pagetop/src/base/component/menu.rs b/pagetop/src/base/component/menu.rs
index 5cc46925..34ab59fe 100644
--- a/pagetop/src/base/component/menu.rs
+++ b/pagetop/src/base/component/menu.rs
@@ -1,17 +1,17 @@
 mod menu_main;
-pub use menu_main::{Menu, COMPONENT_BASE_MENU};
+pub use menu_main::Menu;
 
 mod item;
-pub use item::{Item, ItemType, COMPONENT_BASE_MENU_ITEM};
+pub use item::{Item, ItemType};
 
 mod submenu;
-pub use submenu::{Submenu, COMPONENT_BASE_MENU_SUBMENU};
+pub use submenu::Submenu;
 
 mod megamenu;
-pub use megamenu::{Megamenu, COMPONENT_BASE_MENU_MEGAMENU};
+pub use megamenu::Megamenu;
 
 mod group;
-pub use group::{Group, COMPONENT_BASE_MENU_GROUP};
+pub use group::Group;
 
 mod element;
-pub use element::{Element, ElementType, COMPONENT_BASE_MENU_ELEMENT};
+pub use element::{Element, ElementType};
diff --git a/pagetop/src/base/component/menu/element.rs b/pagetop/src/base/component/menu/element.rs
index c01c0f49..04059f05 100644
--- a/pagetop/src/base/component/menu/element.rs
+++ b/pagetop/src/base/component/menu/element.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::Submenu;
 
@@ -16,15 +17,13 @@ pub enum ElementType {
 // Element.
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Element {
     weight      : Weight,
     renderable  : Renderable,
     element_type: ElementType,
 }
 
-impl_handle!(COMPONENT_BASE_MENU_ELEMENT for Element);
-
 impl ComponentTrait for Element {
     fn new() -> Self {
         Element::default()
diff --git a/pagetop/src/base/component/menu/group.rs b/pagetop/src/base/component/menu/group.rs
index 906cb638..2278a504 100644
--- a/pagetop/src/base/component/menu/group.rs
+++ b/pagetop/src/base/component/menu/group.rs
@@ -1,9 +1,10 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::Element;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Group {
     id        : OptionId,
     weight    : Weight,
@@ -11,8 +12,6 @@ pub struct Group {
     elements  : TypedComponents<Element>,
 }
 
-impl_handle!(COMPONENT_BASE_MENU_GROUP for Group);
-
 impl ComponentTrait for Group {
     fn new() -> Self {
         Group::default()
diff --git a/pagetop/src/base/component/menu/item.rs b/pagetop/src/base/component/menu/item.rs
index ec3edf02..42bcd935 100644
--- a/pagetop/src/base/component/menu/item.rs
+++ b/pagetop/src/base/component/menu/item.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::{Megamenu, Submenu};
 
@@ -22,7 +23,7 @@ pub enum ItemType {
 // Item.
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Item {
     weight     : Weight,
     renderable : Renderable,
@@ -32,8 +33,6 @@ pub struct Item {
     right_icon : OptionComponent<Icon>,
 }
 
-impl_handle!(COMPONENT_BASE_MENU_ITEM for Item);
-
 impl ComponentTrait for Item {
     fn new() -> Self {
         Item::default()
diff --git a/pagetop/src/base/component/menu/megamenu.rs b/pagetop/src/base/component/menu/megamenu.rs
index 7ec224d9..7415f97d 100644
--- a/pagetop/src/base/component/menu/megamenu.rs
+++ b/pagetop/src/base/component/menu/megamenu.rs
@@ -1,9 +1,10 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::Group;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Megamenu {
     id        : OptionId,
     weight    : Weight,
@@ -11,8 +12,6 @@ pub struct Megamenu {
     groups    : TypedComponents<Group>,
 }
 
-impl_handle!(COMPONENT_BASE_MENU_MEGAMENU for Megamenu);
-
 impl ComponentTrait for Megamenu {
     fn new() -> Self {
         Megamenu::default()
diff --git a/pagetop/src/base/component/menu/menu_main.rs b/pagetop/src/base/component/menu/menu_main.rs
index a670be8a..adb56e50 100644
--- a/pagetop/src/base/component/menu/menu_main.rs
+++ b/pagetop/src/base/component/menu/menu_main.rs
@@ -1,9 +1,10 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::Item;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Menu {
     id        : OptionId,
     weight    : Weight,
@@ -11,8 +12,6 @@ pub struct Menu {
     items     : TypedComponents<Item>,
 }
 
-impl_handle!(COMPONENT_BASE_MENU for Menu);
-
 impl ComponentTrait for Menu {
     fn new() -> Self {
         Menu::default()
diff --git a/pagetop/src/base/component/menu/submenu.rs b/pagetop/src/base/component/menu/submenu.rs
index caf3f1ec..2af93485 100644
--- a/pagetop/src/base/component/menu/submenu.rs
+++ b/pagetop/src/base/component/menu/submenu.rs
@@ -1,9 +1,10 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 use super::Item;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Submenu {
     id        : OptionId,
     weight    : Weight,
@@ -12,8 +13,6 @@ pub struct Submenu {
     items     : TypedComponents<Item>,
 }
 
-impl_handle!(COMPONENT_BASE_MENU_SUBMENU for Submenu);
-
 impl ComponentTrait for Submenu {
     fn new() -> Self {
         Submenu::default()
diff --git a/pagetop/src/base/component/paragraph.rs b/pagetop/src/base/component/paragraph.rs
index dfa7a253..e4ce4ab7 100644
--- a/pagetop/src/base/component/paragraph.rs
+++ b/pagetop/src/base/component/paragraph.rs
@@ -1,7 +1,8 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Paragraph {
     id        : OptionId,
     weight    : Weight,
@@ -11,8 +12,6 @@ pub struct Paragraph {
     stuff     : AnyComponents,
 }
 
-impl_handle!(COMPONENT_BASE_PARAGRAPH for Paragraph);
-
 impl ComponentTrait for Paragraph {
     fn new() -> Self {
         Paragraph::default()
@@ -46,17 +45,6 @@ impl ComponentTrait for Paragraph {
     }
 }
 
-impl ComponentClasses for Paragraph {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Paragraph {
     pub fn with(component: impl ComponentTrait) -> Self {
         Paragraph::default().add_component(component)
diff --git a/pagetop/src/base/component/powered_by.rs b/pagetop/src/base/component/powered_by.rs
index 0f0991b5..97b6af01 100644
--- a/pagetop/src/base/component/powered_by.rs
+++ b/pagetop/src/base/component/powered_by.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[derive(Default, Eq, PartialEq)]
 pub enum PoweredByLogo {
@@ -11,7 +12,7 @@ pub enum PoweredByLogo {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct PoweredBy {
     weight    : Weight,
     renderable: Renderable,
@@ -19,8 +20,6 @@ pub struct PoweredBy {
     logo      : PoweredByLogo,
 }
 
-impl_handle!(COMPONENT_BASE_POWEREDBY for PoweredBy);
-
 impl ComponentTrait for PoweredBy {
     fn new() -> Self {
         let year = Utc::now().format("%Y").to_string();
diff --git a/pagetop/src/base/component/translate.rs b/pagetop/src/base/component/translate.rs
index b32b1b64..bb6bb34e 100644
--- a/pagetop/src/base/component/translate.rs
+++ b/pagetop/src/base/component/translate.rs
@@ -1,10 +1,9 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
-#[derive(SmartDefault)]
+#[derive(CrateHandle, SmartDefault)]
 pub struct Translate(L10n);
 
-impl_handle!(COMPONENT_BASE_TRANSLATE for Translate);
-
 impl ComponentTrait for Translate {
     fn new() -> Self {
         Translate::default()
diff --git a/pagetop/src/base/component/wrapper.rs b/pagetop/src/base/component/wrapper.rs
index 2cfa7fdc..72e9744c 100644
--- a/pagetop/src/base/component/wrapper.rs
+++ b/pagetop/src/base/component/wrapper.rs
@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
 #[derive(SmartDefault)]
 pub enum WrapperType {
@@ -11,7 +12,7 @@ pub enum WrapperType {
 }
 
 #[rustfmt::skip]
-#[derive(SmartDefault)]
+#[derive(ComponentClasses, CrateHandle, SmartDefault)]
 pub struct Wrapper {
     id           : OptionId,
     weight       : Weight,
@@ -23,8 +24,6 @@ pub struct Wrapper {
     template     : String,
 }
 
-impl_handle!(COMPONENT_BASE_WRAPPER for Wrapper);
-
 impl ComponentTrait for Wrapper {
     fn new() -> Self {
         Wrapper::default()
@@ -83,17 +82,6 @@ impl ComponentTrait for Wrapper {
     }
 }
 
-impl ComponentClasses for Wrapper {
-    fn alter_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
-        self.classes.alter_value(op, classes);
-        self
-    }
-
-    fn classes(&self) -> &OptionClasses {
-        &self.classes
-    }
-}
-
 impl Wrapper {
     pub fn header() -> Self {
         let mut c = Wrapper::default()
diff --git a/pagetop/src/base/theme.rs b/pagetop/src/base/theme.rs
index b78722b0..7b9b442f 100644
--- a/pagetop/src/base/theme.rs
+++ b/pagetop/src/base/theme.rs
@@ -1,8 +1,8 @@
 mod basic;
-pub use basic::{Basic, THEME_BASIC};
+pub use basic::Basic;
 
 mod chassis;
-pub use chassis::{Chassis, THEME_CHASSIS};
+pub use chassis::Chassis;
 
 mod inception;
-pub use inception::{Inception, THEME_INCEPTION};
+pub use inception::Inception;
diff --git a/pagetop/src/base/theme/basic.rs b/pagetop/src/base/theme/basic.rs
index 0a49642e..8e686915 100644
--- a/pagetop/src/base/theme/basic.rs
+++ b/pagetop/src/base/theme/basic.rs
@@ -1,9 +1,9 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
+#[derive(CrateHandle)]
 pub struct Basic;
 
-impl_handle!(THEME_BASIC for Basic);
-
 impl ModuleTrait for Basic {
     fn name(&self) -> L10n {
         L10n::n("Basic")
diff --git a/pagetop/src/base/theme/chassis.rs b/pagetop/src/base/theme/chassis.rs
index f9da9574..844c24c7 100644
--- a/pagetop/src/base/theme/chassis.rs
+++ b/pagetop/src/base/theme/chassis.rs
@@ -1,9 +1,9 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
+#[derive(CrateHandle)]
 pub struct Chassis;
 
-impl_handle!(THEME_CHASSIS for Chassis);
-
 impl ModuleTrait for Chassis {
     fn name(&self) -> L10n {
         L10n::n("Chassis")
diff --git a/pagetop/src/base/theme/inception.rs b/pagetop/src/base/theme/inception.rs
index 1454d5e1..cf70c998 100644
--- a/pagetop/src/base/theme/inception.rs
+++ b/pagetop/src/base/theme/inception.rs
@@ -1,9 +1,9 @@
 use crate::prelude::*;
+use crate::CrateHandle;
 
+#[derive(CrateHandle)]
 pub struct Inception;
 
-impl_handle!(THEME_INCEPTION for Inception);
-
 impl ModuleTrait for Inception {
     fn name(&self) -> L10n {
         L10n::n("Inception")
diff --git a/pagetop/src/core/action/definition.rs b/pagetop/src/core/action/definition.rs
index a1c97db9..00841c35 100644
--- a/pagetop/src/core/action/definition.rs
+++ b/pagetop/src/core/action/definition.rs
@@ -1,4 +1,4 @@
-use crate::{Handle, HasHandle, Weight};
+use crate::{Handle, ImplementHandle, Weight};
 
 use std::any::Any;
 
@@ -6,7 +6,7 @@ pub trait ActionBase: Any {
     fn as_ref_any(&self) -> &dyn Any;
 }
 
-pub trait ActionTrait: ActionBase + HasHandle + Send + Sync {
+pub trait ActionTrait: ActionBase + ImplementHandle + Send + Sync {
     fn referer_handle(&self) -> Option<Handle> {
         None
     }
diff --git a/pagetop/src/core/component/definition.rs b/pagetop/src/core/component/definition.rs
index da7a59be..7843bab4 100644
--- a/pagetop/src/core/component/definition.rs
+++ b/pagetop/src/core/component/definition.rs
@@ -1,7 +1,7 @@
 use crate::base::action;
 use crate::core::component::Context;
 use crate::html::{html, Markup, PrepareMarkup};
-use crate::{util, HasHandle, Weight};
+use crate::{util, ImplementHandle, Weight};
 
 use std::any::Any;
 
@@ -13,7 +13,7 @@ pub trait ComponentBase: Any {
     fn as_mut_any(&mut self) -> &mut dyn Any;
 }
 
-pub trait ComponentTrait: ComponentBase + HasHandle + Send + Sync {
+pub trait ComponentTrait: ComponentBase + ImplementHandle + Send + Sync {
     fn new() -> Self
     where
         Self: Sized;
diff --git a/pagetop/src/core/module/definition.rs b/pagetop/src/core/module/definition.rs
index a353c430..e033487b 100644
--- a/pagetop/src/core/module/definition.rs
+++ b/pagetop/src/core/module/definition.rs
@@ -1,7 +1,7 @@
 use crate::core::action::Action;
 use crate::core::theme::ThemeRef;
 use crate::locale::L10n;
-use crate::{actions, service, util, HasHandle};
+use crate::{actions, service, util, ImplementHandle};
 
 #[cfg(feature = "database")]
 use crate::{db::MigrationItem, migrations};
@@ -13,7 +13,7 @@ pub trait ModuleBase {
 }
 
 /// Los módulos deben implementar este *trait*.
-pub trait ModuleTrait: HasHandle + ModuleBase + Send + Sync {
+pub trait ModuleTrait: ImplementHandle + ModuleBase + Send + Sync {
     fn name(&self) -> L10n {
         L10n::n(self.single_name())
     }
diff --git a/pagetop/src/lib.rs b/pagetop/src/lib.rs
index 7ae2e736..c55189ea 100644
--- a/pagetop/src/lib.rs
+++ b/pagetop/src/lib.rs
@@ -44,15 +44,10 @@
 //! ```rust
 //! use pagetop::prelude::*;
 //!
+//! #[derive(AssignHandle)]
 //! struct HelloWorld;
 //!
-//! impl_handle!(APP_HELLO_WORLD for HelloWorld);
-//!
 //! impl ModuleTrait for HelloWorld {
-//!     fn handle(&self) -> Handle {
-//!         APP_HELLO_WORLD
-//!     }
-//!
 //!     fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
 //!         scfg.route("/", service::web::get().to(hello_world));
 //!     }
@@ -113,7 +108,9 @@ pub use paste::paste;
 /// customized default values.
 pub use smart_default::SmartDefault;
 
-pub use pagetop_macros::{fn_builder, main, test};
+pub use pagetop_macros::{fn_builder, main, test, AssignHandle, ComponentClasses};
+
+pub(crate) use pagetop_macros::CrateHandle;
 
 // *************************************************************************************************
 // GLOBAL.
@@ -124,11 +121,15 @@ pub use static_files::Resource as StaticResource;
 
 pub type Handle = u64;
 
-pub trait HasHandle {
+pub trait ImplementHandle {
     fn static_handle() -> Handle
     where
         Self: Sized;
 
+    fn matches_handle(is: Handle) -> bool
+    where
+        Self: Sized;
+
     fn handle(&self) -> Handle;
 }
 
diff --git a/pagetop/src/prelude.rs b/pagetop/src/prelude.rs
index 7f517184..ee6e9b2e 100644
--- a/pagetop/src/prelude.rs
+++ b/pagetop/src/prelude.rs
@@ -4,11 +4,11 @@
 pub use crate::{concat_string, fn_builder, main, paste, test, SmartDefault};
 
 // Global.
-pub use crate::{Handle, HasHandle, HashMapResources, LazyStatic, Weight};
+pub use crate::{Handle, HashMapResources, ImplementHandle, LazyStatic, Weight};
 
 // Functions and macro helpers.
 pub use crate::util;
-pub use crate::{impl_handle, kv};
+pub use crate::{kv, AssignHandle, ComponentClasses};
 
 // MACROS.
 
diff --git a/pagetop/src/response/fatal_error.rs b/pagetop/src/response/fatal_error.rs
index 7c2fce9f..48f46fa0 100644
--- a/pagetop/src/response/fatal_error.rs
+++ b/pagetop/src/response/fatal_error.rs
@@ -1,7 +1,7 @@
 mod error403;
-pub use error403::ERROR_403;
+pub use error403::Error403;
 mod error404;
-pub use error404::ERROR_404;
+pub use error404::Error404;
 
 use crate::locale::L10n;
 use crate::response::{page::Page, ResponseError};
diff --git a/pagetop/src/response/fatal_error/error403.rs b/pagetop/src/response/fatal_error/error403.rs
index aa9cc41a..e5c80218 100644
--- a/pagetop/src/response/fatal_error/error403.rs
+++ b/pagetop/src/response/fatal_error/error403.rs
@@ -1,11 +1,10 @@
 use crate::core::component::{ComponentTrait, Context};
 use crate::html::{html, PrepareMarkup};
-use crate::impl_handle;
+use crate::CrateHandle;
 
+#[derive(CrateHandle)]
 pub struct Error403;
 
-impl_handle!(ERROR_403 for Error403);
-
 impl ComponentTrait for Error403 {
     fn new() -> Self {
         Self
diff --git a/pagetop/src/response/fatal_error/error404.rs b/pagetop/src/response/fatal_error/error404.rs
index e3a77aac..6000e9cc 100644
--- a/pagetop/src/response/fatal_error/error404.rs
+++ b/pagetop/src/response/fatal_error/error404.rs
@@ -1,11 +1,10 @@
 use crate::core::component::{ComponentTrait, Context};
 use crate::html::{html, PrepareMarkup};
-use crate::impl_handle;
+use crate::CrateHandle;
 
+#[derive(CrateHandle)]
 pub struct Error404;
 
-impl_handle!(ERROR_404 for Error404);
-
 impl ComponentTrait for Error404 {
     fn new() -> Self {
         Self
diff --git a/pagetop/src/util.rs b/pagetop/src/util.rs
index 3cf4301a..ff658da7 100644
--- a/pagetop/src/util.rs
+++ b/pagetop/src/util.rs
@@ -92,44 +92,6 @@ pub fn absolute_dir(
 // MACRO HELPERS.
 // *************************************************************************************************
 
-#[macro_export]
-macro_rules! impl_handle {
-    ( $HANDLE:ident for $Element:ident ) => {
-        /// Constant handle to represent a unique PageTop building element.
-        pub const $HANDLE: $crate::Handle =
-            $crate::util::handle(module_path!(), file!(), line!(), column!());
-
-        impl $crate::HasHandle for $Element {
-            #[inline]
-            fn static_handle() -> $crate::Handle {
-                $HANDLE
-            }
-
-            #[inline]
-            fn handle(&self) -> $crate::Handle {
-                $HANDLE
-            }
-        }
-    };
-    ( $HANDLE:ident for $Element:ident<$Implement:ident> ) => {
-        /// Constant handle to represent a unique PageTop building element.
-        pub const $HANDLE: $crate::Handle =
-            $crate::util::handle(module_path!(), file!(), line!(), column!());
-
-        impl<I: $Implement> $crate::HasHandle for $Element<I> {
-            #[inline]
-            fn static_handle() -> $crate::Handle {
-                $HANDLE
-            }
-
-            #[inline]
-            fn handle(&self) -> $crate::Handle {
-                $HANDLE
-            }
-        }
-    };
-}
-
 #[macro_export]
 /// Macro para construir grupos de pares clave-valor.
 ///
diff --git a/pagetop/tests/server/health_check.rs b/pagetop/tests/server/health_check.rs
index 3f70b8e4..ba3df6de 100644
--- a/pagetop/tests/server/health_check.rs
+++ b/pagetop/tests/server/health_check.rs
@@ -1,9 +1,8 @@
 use pagetop::prelude::*;
 
+#[derive(AssignHandle)]
 struct HealthCheck;
 
-impl_handle!(MODULE_TEST_SERVER_HEALTH_CHECK for HealthCheck);
-
 impl ModuleTrait for HealthCheck {}
 
 #[pagetop::test]