Creating GUI button to auto loot?

Hi,
I'm working in an autoloot plugin but i can't find a way to add a button to the inventory.
Right now the autoloot is done when the player open the other person inventory.
Is possible to add a button ? If not what are the options to call my function?

 

Alot of useful stuff in here Working with Oxide's new "CUI Helper"

 

Thanks. That is not in the documentation and for some reason don't show in google search en we search for ui.