GUI features - Transparency and masks?

Blitz3D Forums/Blitz3D Programming/GUI features - Transparency and masks?

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I am looking to build a GUI for my little demo game that has custom skins. Having looked at the GUI systems listed here in the blitz site and forums, I cannot tell if any support, or don't support, the 2 following features:

1. Buttons/windows with alpha transparency masks? Example: A window with a background that fades from Opaque to Transparent.

2. Along the same lines...Buttons and windows with arbitrary shapes defined by an image/mask. Example: A window shaped like a face.

Any info would be appreciated.
Thanks,