Time signature track

In Cubase 8.5 I’m looking for a key command to open the time signature track. I can assign a command to open the tempo track and am trying to do the same for the signature track. I can’t seem to find one. Any advice? Thanks.

Time signatures are integrated into the Tempo track- there’s no editor for time sigs only.

Thanks. I have to go to Browse Project and look at the left hand column under Project Structure. At the bottom of that list is the signature track that I click to open. Just trying to get there in a quicker way. In a more serious problem, the scrolling in the score editor has stopped working a few moments ago since I was in the preferences/key command area. I live in score editor and it usually works fine. Tried closing the project and restarting the IMac to no avail. Any ideas?