Would HIGHLY RECOMMEND this way simpler and better implementation of how to do a treeview:
You can download the files by supporting them on their Patreon for $3 and it’s WAY BETTER and simpler than the official Treeview implementation IMO
Don’t need to deal with passing Objects around, Casting a bunch of times in obtuse non-legible recursive situations, etc… It’s data oriented - you populate a data table with your data from whatever form you are getting it from e.g. JSON, Array, CSV or otherwise and you can thus easily see the table you are setting up in one place, and generate the widget from it. So much easier, honestly - I already implemented both.