MVC pattern with dynamic, tree stuctured data

Question

I'm experimenting with this hybrid MVC pattern, though the question probably pertains to a range of patterns.

It works great for many common situations. However, I now have a control that represents an arbitrary-depth tree similar to a file system. It's possible to turn each tree node on or off ("checked").

I'm stuck trying to figure out an efficient way to handle this situation. Suggestions based on the above hybrid pattern would be great, as would references to other MVC patterns that handle this better.