it isn't a pop-up.It's just an application which I don't want to see before it's loaded
well, if no way around I can accept white window.
But why does moving it back to the screen fail? And why it fails only sometimes?
Also note that windows cannot be created with widths or heights less than 100 pixels. anything less will be ignored and replaced with 100.
erm, I've just tried to create 10*10 window, and it does work!