public function actionAjaxCreate($field, $value)
 {
     $model = new FinvInvoice();
     $model->{$field} = $value;
     try {
         if ($model->save()) {
             return TRUE;
         } else {
             return var_export($model->getErrors());
         }
     } catch (Exception $e) {
         throw new CHttpException(500, $e->getMessage());
     }
 }