Yii Criteria Condition Order By in Query Syntax

Question

I have the code below and i am trying to add 'order' => 'creation_date DESC' or something similar but i cant get the right sintax (i am trying to order the results in DESC order);

$criteria = new CDbCriteria;
        $total = EmployerContract::model()->count();

        $pages = new CPagination($total);
        $pages->pageSize = 10;
        $pages->applyLimit($criteria);

        $posts = EmployerContract::model()->findAll($criteria);