self.SetBackgroundColour(wx.Colour(255, 255, 232))
         dispatcher.connect(receiver=self.display, signal='Shell.calltip')
 
     def display(self, calltip):
         """Receiver for Shell.calltip signal."""
         self.SetBackgroundColour(wx.Colour(255, 255, 232))
         dispatcher.connect(receiver=self.display, signal='Shell.calltip')
 
     def display(self, calltip):
         """Receiver for Shell.calltip signal."""