def __init__(self, *args, **kwargs):
        HasProperties.__init__(self, *args, **kwargs)

        HasSignals.__init__(self)
        self.sig_register("closed")
        self.sig_register("changed")
    def __init__(self, **kwargs):
        HasProperties.__init__(self, **kwargs)

        HasSignals.__init__(self)
        self.sig_register('notify')
        self.sig_register('notify::labels')