[SOLVED] how to setup prestashop 1.4 to show default order by Quantity

[delite]

Is there any way to make prestashop 1.4 show default order by Quantity instead of product name, product price, etc in prestashop 1.4? As i remeber in prestashop 1.3 all you had to do is add

array('id' => '3', 'name' => $this->l('Quantity'))

in admin/tabs/AdminPPreferences.php but now it dosnt seem working anymore.

Edit: 'id' => '3' was duplicated so after change it to 'id' => '6' it works!