AC-7 Core HD ipad app for remote control of Sonar

Dear all,
I have the above app, and it works well...at least as well as my behringer bcf. However, I just can't figure out how to toggle between tracks and busses. I can move between banks of tracks no problem, and I have the same configuration as I had with the behringer. I haven't received any reply from the software make and their manual doesn't provide the answer.
Does anyone use this app and can they help?
I am using Sonar X3e
Many thanks...oh...and a happy Christmas to you all.
Jim