yii ajax flash messages

CategoryFeatureRestrictedController.php

if (isset($_POST['CategoryFeatureRestrictedValue'])) {
            $model->attributes = $_POST['CategoryFeatureRestrictedValue'];

            if ($model->validate()) {
                //$response['status'] = $model->save();

                //$response['flash_msg'] = Yii::app()->user->getFlashes();
                //echo CJSON::encode($response);

                $this->redirect(array('index', 'categoryFeatureId' => $model->category_feature_id));
            } else {
                //Yii::app()->user->setFlash('category', 'Category feature was saved successfully');
            }
        }