public function Base_Render_Before($Sender) {
      // Add "Mark All Viewed" to main menu
      if ($Sender->Menu && Gdn::Session()->IsValid()) {
         if (C('Plugins.AllViewed.ShowInMenu', TRUE))
            $Sender->Menu->AddLink('AllViewed', T('Mark All Viewed'), '/discussions/markallviewed');
      }
   }