def METHOD_NAME(self):
    """
    Refreshes the list of tags to display in the textbox, and selects
    the correct radio button
    """
    tags_list = self.backend.get_parameters()[self.parameter_name]
    has_all_tasks = ALLTASKS_TAG in tags_list
    self.all_tags_radio.set_active(has_all_tasks)
    self.some_tags_radio.set_active(not has_all_tasks)
    self._refresh_textbox_state()
    if not has_all_tasks:
        tags_text = ""
        if tags_list:
            tags_text = reduce(lambda a, b: a + ", " + b, tags_list)
        self.tags_entry.set_text(tags_text)