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Setting a transparent background color for timagelist

Question: How do I set the transparent color in an TImageList so the background color doesn't show? Answer: Use the TImageList.AddMasked(Bitmap: TBitmap; MaskColor: TColor) method. You can either pass the transparent color yourself in the second parameter or clDefault to let the imagelist take the bottom-left pixel's color. TSpeedButton and TBitBtn use this method. Check-out buttons.pas (around line 560) to see an example.