code: def load_tab_data(self):
          
          for tab in self._tabs.values():
              if tab.load and not tab.data_loaded:
                  try:
                      tab._data = tab.get_context_data(self.request)
                  except Exception:
                      tab._data = False
                      exceptions.handle(self.request)
docs: Preload all data that for the tabs that will be displayed.