[Gtk-sharp-list] Problem with DeleteEvent

[miguel díaz]

hi all,
in my window delete event i want to test if a text
view has changed before exiting the application but
when i run the programm, it ignores it, my warning
dialog does not appear and mono throw this message:

...gdk warning: gdk_property_delete:general case not
implemented
...gdk warning: window unexpectedly destroyed

can anyone tell me what is wrong? here my code

public void WindowDelete (object obj, DeleteEventArgs
args) 
        {
            if(contentsModified == true){
				new WarningDialog();
				Application.Quit();
			}
			else{
								Application.Quit();
			}
            
        }


	
	
		
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