@s_bach Aha! That helps! I will see how this works this weekend.

Sebastian, Added tags. Not really a question but a request. I thought that I had read about people adding a TreeView to the AM using GetDDescription() but maybe it wasn't as well fleshed out as they (or I) suspected. I will look into the custom data type and GUI for it. Please mark as Solved. Thanks! Robert

Hi @Kuroyume0161, first of all, welcome back in the plugincafe community, I'm glad to see you here! Unfortunately, this is not possible to use directly a BaseList with a TreeView and as you already figured it out, you have to maintain this list yourself. While it's very nice that a TreeView offer this abstraction level, and allows to make a list from any kind of data, it has the overhead to builds this TreeView layer. Cheers, Maxime.