'Loads the tab group.
It compiles the table instances for each table attached to
any :class:`horizon.tabs.TableTab` instances on the tab group.
This step is necessary before processing any tab or table actions.'

def load_tabs(self):

    tab_group = self.get_tabs(self.request, **self.kwargs)
    tabs = tab_group.get_tabs()
    for tab in [t for t in tabs if issubclass(t.__class__, TableTab)]:
        self.table_classes.extend(tab.table_classes)
        for table in tab._tables.values():
            self._table_dict[table._meta.name] = {'table': table, 'tab': tab}
