--- a/ui/cocoa/MainWindow.h	Sun Oct 19 10:10:06 2025 +0200
+++ b/ui/cocoa/MainWindow.h	Sun Oct 19 12:08:32 2025 +0200
@@ -29,7 +29,7 @@
 #import "toolkit.h"
 #import "../ui/window.h"
 
-@interface MainWindow : NSWindow
+@interface MainWindow : NSWindow<UiToplevelObject>
 
 @property (strong) NSView *sidebar;
 @property (strong) NSView *leftPanel;