code: def _update_display(self, event=None):
          
          try:
              if self._showvalue:
                  self.display_value(self.scale.get())
              if self._tickinterval:
                  self.place_ticks()
          except IndexError:
              # happens when configure is called during a orientation change
              # because self.ticks is empty
              pass
docs: Redisplay the ticks and the label so that they adapt to the new size of the scale.