When matplotlib is embeded in a pyGTK application, how to make the NavigationToolbar2 key ('1' '2' 'a' 'g' ..) working??

Hi all,

I would like to enable the key pressed event (key ‘1’ ‘2’ ‘a’ ‘g’ … ) of NavigationToolbar2 in my pyGTK app.
(These keys shortcut are described here:

The shorcuts work perfectly using pylab. But when I include matplotlib in my pyGTK app the shorcuts are broken.

How could I manage to make them work,
where I should start in the source code to undestand how it work, that I could reproduce the shorkey behavior directly in my own application code?.