self.connect('button-press-event', self.on_button_press_event)
self.connect('button-release-event', self.on_button_release_event)
self.connect('motion-notify-event', self.on_motion_notify_event)
self.connect('button-press-event', self.on_button_press_event)
self.connect('button-release-event', self.on_button_release_event)
self.connect('motion-notify-event', self.on_motion_notify_event)