[pygtk] adding a close button to a notebook

[N. Volbers]

Hello everyone,

I am using a notebook for a sort of tabbed interface a la Firefox. 
Currently, there is a close button for each tab, positioned in the tab 
widget. However, I would like to have just a single close button at the 
very right of the notebook (again, just like Firefox does). Is there a 
way to add a widget inside the notebook tab box?

Best regards,

Niklas.