Andrea, Are you using MPL with wxPython? I'd expect
> so.
> In which case, you can use it embedded, and have wx
> do the event handling. I really think that's the way
> to go. I'm not sure it's such a good idea for MPL to
> wrap GUI functionality, let's not try to build a yet
> another GUI toolkit -- that way lies AnyGUI, and that
> way lies madness!
and that way underlies the matplotlib toolbar, and matplotlib code
that you can share with others and have others contribute to!
Madness? Yes, but just crazy enough that it might work 
JDH