diff -r b47bda6666ce -r de653b07050b ui/winui/button.cpp
--- a/ui/winui/button.cpp	Wed Nov 13 22:02:50 2024 +0100
+++ b/ui/winui/button.cpp	Thu Nov 14 17:26:16 2024 +0100
@@ -98,6 +98,7 @@
 	UIElement elm = button;
 	UiWidget* widget = new UiWidget(elm);
 	ui_context_add_widget_destructor(current->ctx, widget);
+	ui_set_widget_groups(current->ctx, widget, args.groups);
 
 	// register callback
 	if (args.onclick) {
@@ -175,6 +176,24 @@
 	}
 }
 
+static void togglebutton_changed(UiObject *obj, bool checked, ui_callback onchange, void *onchangedata, int enable_state) {
+	if (onchange) {
+		UiEvent evt;
+		evt.obj = obj;
+		evt.window = obj->window;
+		evt.document = obj->ctx->document;
+		evt.eventdata = nullptr;
+		evt.intval = checked;
+		onchange(&evt, onchangedata);
+	}
+	if (enable_state > 0) {
+		if (checked) {
+			ui_set_group(obj->ctx, enable_state);
+		} else {
+			ui_unset_group(obj->ctx, enable_state);
+		}
+	}
+}
 
 static UIWIDGET create_togglebutton(UiObject *obj, ToggleButton button, UiToggleArgs args) {
 	UiObject* current = uic_current_obj(obj);
@@ -187,6 +206,7 @@
 	UIElement elm = button;
 	UiWidget* widget = new UiWidget(elm);
 	ui_context_add_widget_destructor(current->ctx, widget);
+	ui_set_widget_groups(current->ctx, widget, args.groups);
 
 	// bind variable
 	UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.value, args.varname, UI_VAR_INTEGER);
@@ -201,6 +221,15 @@
 		togglebutton_register_unchecked_observers(button, obj, var);
 	}
 
+	if (args.enable_group > 0 || args.onchange) {
+		button.Checked([obj, args](IInspectable const& sender, RoutedEventArgs) {
+			togglebutton_changed(obj, true, args.onchange, args.onchangedata, args.enable_group);
+		});
+		button.Unchecked([obj, args](IInspectable const& sender, RoutedEventArgs) {
+			togglebutton_changed(obj, false, args.onchange, args.onchangedata, args.enable_group);
+			});
+	}
+
 	// add button to current container
 	UI_APPLY_LAYOUT1(current, args);
 
@@ -234,6 +263,7 @@
 	UIElement elm = button;
 	UiWidget* widget = new UiWidget(elm);
 	ui_context_add_widget_destructor(current->ctx, widget);
+	ui_set_widget_groups(current->ctx, widget, args.groups);
 
 	// bind variable
 	UiVar* var = nullptr;
@@ -274,6 +304,7 @@
 	UIElement elm = button;
 	UiWidget* widget = new UiWidget(elm);
 	ui_context_add_widget_destructor(current->ctx, widget);
+	ui_set_widget_groups(current->ctx, widget, args.groups);
 
 	UiVar* var = nullptr;
 	if (args.value) {