code: def _handleInvertAxesSelected(self, evt):
          
          if len(self._axisId) == 0: return
          for i in range(len(self._axisId)):
              if self._menu.IsChecked(self._axisId[i]):
                  self._menu.Check(self._axisId[i], False)
              else:
                  self._menu.Check(self._axisId[i], True)
          self._toolbar.set_active(self.getActiveAxes())
          evt.Skip()
docs: Called when the invert all menu item is selected