How to add sort products by category in admin products list?

[inkomico]

There is a category header in products list, but sorting is not activated.

I created a override to products list, but I don`t know how to do it.

Just uncomment this code?

Code Select Expand

<?php /* <th><?php echo JHTML::_('grid.sort', 'COM_VIRTUEMART_CATEGORY', 'c.category_name', $this->lists['filter_order_Dir'], $this->lists['filter_order'] ); ?></th> */ ?>

Thanks.