diff -r 6d9066951cdb -r bcb3c7d486f3 ui/win32/window.c
--- a/ui/win32/window.c	Wed Oct 08 09:46:23 2025 +0200
+++ b/ui/win32/window.c	Wed Oct 08 10:41:35 2025 +0200
@@ -27,7 +27,9 @@
  */
 
 #include "window.h"
-#include "Windows.h"
+#include <Windows.h>
+
+#include "container.h"
 
 #include "../common/object.h"
 
@@ -99,7 +101,11 @@
 	W32Widget *widget = w32_widget_new(&w32_toplevel_widget_class, hwnd);
 	obj->widget = widget;
 	obj->ref = 1;
-	
+
+	// TODO: switch to box container
+	UiContainerX *container = ui_grid_container_create(obj, hwnd, 0, 0, 0, 0);
+	uic_object_push_container(obj, container);
+
 	return obj;
 }