[f-nsp] What is the prefered way to add a vlan to a topo-group

[goverton at nwi.net]

What is the prefered way to add a vlan to a topo-group? I get this error
if I try to add a vlan to a topo-group.

error - topology group 1 control tagged ports not present in vlan 3125

This is on a Foundry MLX-16 running Version 3.6.0bT163

If I add the tagged ports before the adding it to the topo-group I would
get a loop.