protected function renderContent()
  {
    if(!is_null($this->module))
    {
      $categories = Categories::getOptions($this->module);
      foreach($categories as $key=>$value)
      {
        echo Html::a(strtoupper(Html::encode($value)), array($this->target,'category'=>$key,'reference'=>Html::encode($value)), array('class'=>$this->linkclass))
        ." // \n";
      }
    }
    else
    {
      echo " ";
    }
  }