Sack Library Documentation
sack::PSI::SetCommonTransparent Function
void SetCommonTransparent(PSI_CONTROL pc, LOGICAL bTransparent);

this allows the application to toggle the transparency characteristic of a control. If a control is transparent, then it behaves automatically as one should using CopyOriginalSurface and restoring that surface before doing the draw. The application does not need to concern itself with restoring the prior image, but it must also assume that the entire surface has been destroyed, and partial updates are not possible.

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