>> Did you try thisform.Draw() at the end of resize process?
>Yes, also tried thisform.refresh. But it seems the problem is not in the form, but the environment behind the form. Also it seems this is only in VFP, not with another application or desktop. Don't forget it's using COM-EXE.
What about BITMAP settings?
Are you running with _screen off or ON?
If it's not broken, fix it until it is.
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