>AH, I am sorry, now only I realize UT's [View] button (View all messages of this thread) won't show attachedment of a message at all. I must click and bring up your previous message alone in order to see your attached GIF...
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>Btw, I try your GIF with the codes that I have presented earlier, it works exactly like mine... I mean it also screw up if the background is transparent. (Note that for all my attached snapshot, the sandpaper pattern is my VFP application desktop background (it is not plain white)
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>Please see attached snapshots of this message.

It works on plain background of any color but not an image background.