def on_close(self, event):
    '\n        Close event\n        '
    if (self.manager is not None):
        self.manager.kiessig_frame = None
    self.Destroy()
Close event
def on_close(self, event):
    '\n        \n        '
    if (self.manager is not None):
        self.manager.kiessig_frame = None
    self.Destroy()