Gtk Widget Transparency

[Tristin Celestin <tristin_celestin yahoo com>]

I am trying to understand how to make individual widgets in GTK 
transparent, like how it is done in gnome-terminal, as opposed to 
setting the opacity of an entire heirarchy via set_opacity ().



All the examples demonstrating transparent widgets use a cairo canvas 
and require that you perform all the drawing yourself, such as the 
example at 
http://mikehearn.wordpress.com/2006/03/26/gtk-windows-with-alpha-channels/, 
posted in a  November 2009 mailing about the same topic. However, I 
don't want to draw a custom widget, I just want to adjust the opacity of 
an existing, non-toplevel one.



How do I do this?



Tristin