Thread:StephenTX/@comment-25046890-20160206080318/@comment-10228869-20160208164546

You can use Navbox with collapsible groups as a child too, but I doubt you'll be happy with the result. See here (group 2) for an example.

We might be able to improve that a bit with some CSS tricks on the subgroup navbar coloring, but IMHO the usability would still leave a lot to be desired.