New BGRAControls v6.7
https://github.com/bgrabitmap/bgracontrols/releases/tag/v6.7-Fix ColorSpeedButton borders
-Anchors property for BCComboBox
-Added parent background property in TBCPanel
-Added transparency in TCustomControl descendants
What I found interesting is that despite all threads talking that TCustomControl descendants can't have transparency is not 100% true.
There's an option called csParentBackground in ControlStyle, so you can have for example a background gradient in a TBCPanel and put a TBCButtonFocus in top of it and it will be drawn like a transparent control.
Just adding this line:
ControlStyle := ControlStyle + [csParentBackground];
Enables the behaviour.