'Called whenever one of the specific axis menu items is selected'

def _onMenuItemSelected(self, evt):

    current = self._menu.IsChecked(evt.GetId())
    if current:
        new = False
    else:
        new = True
    self._menu.Check(evt.GetId(), new)
    self._toolbar.set_active(self.getActiveAxes())
    evt.Skip()
