1) this in main() is never set, therefore it refers to the global object (window). Use "new main()" instead. 2) You can avoid using "self" if you bind your functions. 3) Hiding the actor is not enough, you need to destroy it completely. 4) You're not asking for struts, so you're eating events from underlying windows. 5) .actor is a very general style class, and is likely to conflict with built-in theming.