code: def draw(self, drawDC=None):
          
          DEBUG_MSG("draw()", 1, self)
          self.renderer = RendererWx(self.bitmap, self.figure.dpi)
          self.figure.draw(self.renderer)
          self._isDrawn = True
          self.gui_repaint(drawDC=drawDC)
docs: Render the figure using RendererWx instance renderer, or using a
          previously defined renderer if none is specified.