I have tried coding a simple application in pyGTK and I remember I had trouble getting button_press event in a DrawingArea.if i add a motion_notify or even a butten_press event to an image object it does absolutly nothing :s
I was using glade and despite having declared a handler to this event, I had to manually call add_events(gtk.gdk.BUTTON_PRESS_MASK) (the connect was ok but the event mask was not).
Have you checked this?
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