public function actionRemoveParent($itemName, $parentName)
    {
        /* @var $am CAuthManager|AuthBehavior */
        $am = Yii::app()->getAuthManager();

        if ($am->hasItemChild($parentName, $itemName)) {
            $am->removeItemChild($parentName, $itemName);
            if ($am instanceof CPhpAuthManager) {
                $am->save();
            }
        }

        $this->redirect(array('view', 'name' => $itemName));
    }