Music - Associating Sub-tracks to Switches/States doesn't work?

Question

On this page :
https://www.audiokinetic.com/library/2015.1.4_5497/?source=Help&id=associating_sub_tracks_to_switches_states
It implies that you can use changing game states to switch on/off music tracks if they are part of a switch subtrack. 
i.e. You've got a music segment playing but want to control what tracks within that play, but don't want to use parameters, or have to transition to a new segment to do this.
It says "The behavior of the track upon a switch/state change is set via the Transitions tab." - but since this is not a switch container you can't actually add any transitions to the segment.
If you set the Track type to Switch and select groups the state groups show up in the transport control, but switch groups don't.

Am I missing something here ? Or is this just written confusingly? Or does it just not work?

Cheers!
R.