White edge next to track icon

Hi there,
some tracks in my project window have a white edge to the right of the track icon. The slot in the mixer of these tracks show a white line at the bottom.

Does anyone know what that is?

I am using Cubase 6.5.4, some CMC controller, UR28M on windows 7 (if that helps any),


It is an actively remote control device selected tack.


it means, which tracks are assignet with your CMC controllers, at the moment. You can change it by channel select, or bank (it depends, which CMC controller exactly do you have). Then, you can control different tracks.