/**
  * Manages all models.
  */
 public function actionAdmin()
 {
     $model = new Modification('search');
     $model->unsetAttributes();
     // clear any default values
     if (isset($_GET['Modification_markname']) && !isset($_GET['Modification']['model_id'])) {
         $this->render('admin', array('model' => $model, 'markId' => $_GET['Modification_markname']));
         Yii::app()->end();
     }
     if (isset($_GET['Modification'])) {
         $model->attributes = $_GET['Modification'];
     }
     $this->render('admin', array('model' => $model));
 }