def __init__(self, *args, **kwargs):
        self._yaqd_port = kwargs.pop("yaqd_port")
        super().__init__(*args, **kwargs)
        self.grating_index = pc.Combo(
            name="Grating",
            allowed_values=[1, 2],
            section=self.name,
            option="grating_index",
            display=True,
            set_method="set_turret",
        )
        self.exposed.append(self.grating_index)