code: def get_tab(self, tab_name, allow_disabled=False):
          
          tab = self._tabs.get(tab_name, None)
          if tab and tab._allowed and (tab._enabled or allow_disabled):
              return tab
          return None
docs: Returns a specific tab from this tab group.
  
          If the tab is not allowed or not enabled this method returns ``None``.
  
          If the tab is disabled but you wish to return it anyway, you can pass
          ``True`` to the allow_disabled argument.