Impossible to change color of MasterOuttrack in MixConsole

Same issue since Cubasse 7, U can change track’s colors in mixConsole, except Stereo Out ( main bus out).
The only way i’ve found is to put Stereo Out track in Write Mode, then deactivate it.
So, a Stereo Out track is created in the project folder, and you can change color like other tracks in project folder.

Maybe a track has to be in the Mixconsole AND in the project folder to change his color?
But, by default, Stereo Out track isn’t in the project folder…

I have the same problem, and since installing cubase Pro 8 in 7.5 it became gray too. Usually the inputs and outputs are red.