I am creating a UI for Mobu and I found some UI elements native to Motion builder but cant seem to find where to locate them in python.

In the extensions and ctrl handles they have a container box that lists all of the objects associated with the element, and also a browse button that lists a tree of the scene with check boxes along side to select your objects (Sorry dont know what the technical term is)

The closest thing i have come up with is FBTree which has alot of the things i need in it, but not the object list that will hold all of the object i have selected…

Is there a way to call these?