public function Controller_Delete($Sender) {
      $Sender->Permission('Garden.Settings.Manage');
      
      $TagID = GetValue(1, $Sender->RequestArgs);
      $TagModel = new TagModel();
      $Tag = $TagModel->GetID($TagID, DATASET_TYPE_ARRAY);
      if ($Sender->Form->AuthenticatedPostBack()) {
         // Delete tag & tag relations.
         $SQL = Gdn::SQL();
         $SQL->Delete('TagDiscussion', array('TagID' => $TagID));
         $SQL->Delete('Tag', array('TagID' => $TagID));
         
         $Sender->InformMessage(FormatString(T('<b>{Name}</b> deleted.'), $Tag));
         $Sender->JsonTarget("#Tag_{$Tag['TagID']}", NULL, 'Remove');
      }

      $Sender->SetData('Title', T('Delete Tag'));
      $Sender->Render('delete', '', 'plugins/Tagging');
   }