code: def render_startmenu(self, ctx, data):
          
          if self.username is None:
              return ''
          translator = self._getViewerPrivateApplication()
          pageComponents = translator.getPageComponents()
          return startMenu(translator, pageComponents.navigation, ctx.tag)
docs: For authenticated users, add the start-menu style navigation to the
          given tag.  For unauthenticated users, remove the given tag from the
          output.
  
          @see L{xmantissa.webnav.startMenu}