Сортировка CListView в yii

Please consider this:

class User extends CActiveRecord
{
    ...
    public function relations()
    {
        return array(
            ...    
            'articleCount' => array(self::STAT, 'Article', 'userid'),
            ...    
            );
    }
    ...
}

Now, I need to create a $dataProvider = new CActiveDataProvider(...) to feed a CListView widget to which I want add articleCount to the property sortableAttributes so that I can sort User records according to the number of articles the user is the author for.

What are the most convenient method? what are the other alternatives?