adding widgets to the main ui using python extensions

[Marimpis Avraam <makism venus cs teicrete gr>]

First of all, please excuse me if my question is somewhat... stupid :P

Is it possible to add any gtk+ widgets to the main ui of nautilus using 
the python extensions. If so, is it possible to provide an example?
I read about the providing (column,menu,property,etc) interfaces, but 
maybe i`m missing something?

Thanks in advance,
Makis