It isn't HWND per control indeed, it does its own composition, hence why i mentioned Swing and JavaFX with an "especially the latter" in parentheses (but Swing

It isn't HWND per control indeed, it does its own composition, hence why i mentioned Swing and JavaFX with an "especially the latter" in parentheses (but Swing also does bypass the underlying window system aside from the toplevel stuff for per-control functionality whenever that'd make sense).