Update position

[basvandertogt]

I build a custom faq module with the ability to manually sort the list in the backend (position field).

But i can't get it work.

I found this article but it looks this is not working in 1.6 http://neemzy.org/articles/prestashop-de-l-usage-du-champ-position-d-un-modele-dans-le-controleur-de-back-office-correspondant

How can i get the update position function work? 

Can somebody explain me how to do this step by step?

Using Prestashop 1.6