How to use TreeGridContainer

Hi Team

I am trying to use the TreeGridContainer on a form, but the documentation is a bit sparse.

I was trying to go through the blog written by Skyler:  https://community.aras.com/b/english/posts/building-tree-grid-containers

but he unfortunately left out a few details. The one bit that he left out it seems is the html code that is required in the html field on the form.

I tried to combine his tutorial with the Express ECO Impact Matrix as an example, but I am stuck!

I would appreciate it if anybody can guide me a bit.

Kind Regards

Riaan