I noticed that Label and Checkbox widgets sometimes are displayed with an unexpected background color (some gray) w.r.t. the specified one. The strange thing is that this behavior is a bit randomly occurring at each launch of an application.
It seems dependent on some timing of window update or something like that.
Another request: is it possible to let the Checkbox widget to get a real empty string with no visual impact ?
Currently, passing "" still shows a small rectangle on the right, while sometimes you want to have a label on the left instead of using the Check box right-side string.