How To: Adding Columns to Existing Kinetic Grid

Can this be used on Landing Pages, particularly the PO Entry Landing Page, or does the Method Directive need to be used for it?

Application Studio - Add New Column to Purchase Order Entry Landing Page - Kinetic ERP - Epicor User Help Forum

I am trying to add the PO Total, PO Due Date, and PO Promise Date for context. I followed @hmwillett 's post 3 to the best of my ability, but I’m thinking I didn’t get the correct event for the main form loading (I’m trying to use the browser debugging, but not having a lot of luck with it). Does anyone have any recommendations as to either which event I should be setting this after or if I should switch gears and start trying the Method Directive version?