def METHOD_NAME(self):
    if isinstance(self._value, Range):
        if self._value.begin is None:
            self.begin.set_text('')
        else:
            self.begin.set_text(self._value.begin.decompile())
        if self._value.ending is None:
            self.ending.set_text('')
        else:
            self.ending.set_text(self._value.ending.decompile())
        if self._value.delta is None:
            self.delta.set_text('')
        else:
            self.delta.set_text(self._value.delta.decompile())
    else:
        self.begin.set_text('')
        self.ending.set_text('')
        self.delta.set_text('')