Looking for scripting help with Combo Boxes

Hello-

I am looking for a way to populate a combo box with a list of figures (G8M, G8F, etc).  What container is this part of?

Once that item is selected, I would like to populate the tree of nodes (head, neck upper, neck lower, etc...) in another combo box.

Does anyone know of another forum or the way to do this?  Thanks! :)