Get the datasource from caller MenuItemButton

Hi all

I have a form with 3 Action MenuItemButtons. In that form I have 3 different datasources. 

The menuItems call the same class.

I have set the datasource property for all 3 menuItems. 

In the class main menu I have this code:

pdp = args.caller().dataSource(0);

The problem is that it always take the same datasource no matter which button is clicked.