def append(self, option):
        """
        Appends a new `option` to the end of the ButtonGroup.

        :param string/List option:
            The option to append to the ButtonGroup. If a 2D list is specified,
            the first element is the text, the second is the value.
        """
        self._options.append(self._parse_option(option))
        self._refresh_options()
        self.resize(self._width, self._height)
Appends a new `option` to the end of the ButtonGroup.

        :param string/List option:
            The option to append to the ButtonGroup. If a 2D list is specified,
            the first element is the text, the second is the value.