Bear with me here, there's many firsts:
My first Maemo app
My first Python app
My first Gtk app

As you can see, the odds are stacked against me. Anyway, I'm building a Windows SideShow application. I'm using the universal driver which means no Windows side code. I've got the protocol handling working fine (Bluetooth for now) and getting all the relevant data.

Part of the data obtained is a gadget icon. This is supposed to be a 32bpp with alpha-channel bitmap. I can display the icon in a Gtk button no problem, but it has a black background. Is there anyway to extract the alpha-channel and use it?