Transparent Window

["Thiago H. Daud de Faria" <thiago sim lme usp br>]

Hey guys,
I'm trying to make a window with some regions transparents, where the
background can be seen.
Actually i got a way to make it passing the draw control to the
application and using to pixmaps as masks, but i don't know how to refresh
the window when i move it or when the background behind it changes.
I really don't think it is the best way to do it.
I want to know if there is something in a higher level to do this.

thanks in advance

TH