>You have created output in your window before the FB's event handler
>routine has had a chance to update the window once. HandleEvents makes an
>initial invalid regionthat is just a small rect (0,0)-(0,0).
>By blackening the window first and later using HandleEvents, the window's
>invalid region is updated, in this case making your small white dot.

Aha! The mystery is revealed to us? :)

>- Hope this helps


Sure should. The CLS approach didn't help, at least when I tried it. But
your demo works nicely. Thanks Stu.

Robert Covington