'Called when the invert all menu item is selected'

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()
