Yii Framework Captcha Conflict With Beforeaction() Function

I have app in Yii and i extend all classes from some base controller and i have these code in it :

protected function beforeAction($action)



        return parent::beforeAction($action);


as i just understand , these code prevent the Captcha to show , because when i delete it , the captcha shows up ! the captcha function is :

public function actions()


        return array(

            // captcha action renders the CAPTCHA image displayed on the contact page








            // page action renders "static" pages stored under 'protected/views/site/pages'

            // They can be accessed via: index.php?r=site/page&view=FileName






So how could i use beforeAction and captcha in same time ?