After WinPaint a bitmap on a form background, subsequent calls to
SclSetScrollBar will erase the form background and leave a white rectangle 
around the scrollbar.

Is there is way to do transparent scrollbar? i.e.:

- only black pixels of the scrollbar are drawn
- the white pixels become transparent

I tried WinSetDrawMode(winOverlay) (and hope that SclSetScrollBar will works as 
WinPaintChars and WinPaintBitmap), but it does not.

Thanks
horace

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