# Create some mouse events for zooming
         self.Bind(wx.EVT_LEFT_DOWN, self.OnMouseLeftDown)
         self.Bind(wx.EVT_LEFT_UP, self.OnMouseLeftUp)
         # Create some mouse events for zooming
         self.Bind(wx.EVT_LEFT_DOWN, self.OnMouseLeftDown)
         self.Bind(wx.EVT_LEFT_UP, self.OnMouseLeftUp)