change layout

Yii 1.1 Installation and Setup
1

I am creating a site with Yii and I want for the frontend (the site controler) to chage the layout but for all actions.I made this code

 function  _construct()


    {


   $this->layout="site";


    }

but is did not work, how can I change the layout for all the actions?

2

this article may be helpful to you, http://www.yiiframew…oc/cookbook/28/

3 


class MyController extends CController


{


   public $layout='site';


}