def is_root_node(self):
        return getattr(self, self._mptt_meta.parent_attr + '_id') is None
Returns the tab size for the given caption, bitmap and button state.
dataset/ETHPy150Open django-mptt/django-mptt/mptt/models.py/MPTTModel.is_root_node--crossover with--dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/wx/wx_upstream/aui/tabart.py/ChromeTabArt.GetTabSize