[pygtk] Filters window in Thunderbird

[Arnau Sanchez]

Hi!

I am trying to make something similar to Thunderbird's filters (if I am not 
wrong, it uses GTK):

http://www.zackrippy.com/images/tech/thunderbird-filter.jpg

but I am really puzzled how to he manages to do that... it seems a TreeView 
(rows are selectable), but there are widgets not available in GTK as cells 
(Entry, Button, always-visible ComboBox), and moreover its columns can have 
different cell types from row to row... even with costumized cellrenderers I 
don't see any way to do that.

Perhaps is it a just GTK table? then how does it make the row selection?

thanks

arnau

ps: I tried to look in Thunderbird code without luck, I've been unable to find 
anything useful in that monster of 320Mb of source code :-(