'This method will be called by artists who are picked and will
fire off :class:`PickEvent` callbacks registered listeners'

def pick_event(self, mouseevent, artist, **kwargs):

    s = u'pick_event'
    event = PickEvent(s, self, mouseevent, artist, guiEvent=mouseevent.guiEvent, **kwargs)
    self.callbacks.process(s, event)
