def METHOD_NAME(self):
    if self.api_object is not None:
        self.windings[0].setToolTip("Winding 1: {0} kV".format(self.api_object.V1))
        self.windings[1].setToolTip("Winding 2: {0} kV".format(self.api_object.V2))
        self.windings[2].setToolTip("Winding 3: {0} kV".format(self.api_object.V3))
    pass