I installed it in my 3.0 but it crashes with a DNU on ��TreeNodeModel>>position:��

I loaded it like this:

The article on��

says that it loads on 3.0 but well, it doesn't say it works there.

Looks like widgets have had a facelift.

What was changed there?

It is an interesting tool for my own work too, so I'd like to have it running.

Any pointers before digging down the rabbit hole?

Phil