Editable Tree Model

[kloffy]

I'm currently trying to add editing capabilities to the Simple Tree Model Example and it isn't going too well. Before I put my malfunctioning code up here, I'd like to ask whether somebody knows full featured Tree Model Example.

Edit: I'm specifically looking for a way to add/remove nodes and edit their contents. I have read the Editable Model doc, but I'm still not quite sure how to implement those methods for a tree-like data structure...