A button control and underlying replacement for TBitmap that properly handles PNG transparency without writing pre-blend code
问题 Delphi 2010's TSpeedButtons did not seem to really support PNG transparency properly, because the Glyph property uses a TBitmap internally, and TBitmap is for bitmaps, and doesn't support PNG transparency properly, and TSpeedButton.Glyph can't support transparency then.. update: But the actual problem was that I had some external stuff (Developer Express components) that was rendering delphi's PNG support non-functional, TImage on the other hand, while it still TPicture, and can support PNG,