Colour of tracks and regions

[idris]

I'm having problems getting tracks and regions the colours I want. And reading the manual hasn't helped.
What I want is :

Tr 1-10 : Red, with both tracks and regions red
Tr 11-20 : Blue, with both tracks and regions blue
When I move a region from a red track to a blue track I want the region to change colour.

What I'm getting includes :
Tracks different colours but Regions all the same colour
Tracks a Regions the right colour, but if I move a Red Region to a Blue Track it stays Red
And I can't find a combination of modifier keys and track / colour selection that will allow me to change colours for just the selected tracks, unless I hide all other tracks and Apply To All.

Help!