Shortcut Key in Sonar Producer X3

I forgot a shortcut key that would do the following.
With all tracks minimized, I adjusted one track to the size I wanted. After doing that and using the shortcut key, I could then click on another track and it would open to the same size while the first track previously selected returned to minimized. Does anyone remember that shortcut key trick?
Thanks in advance,
Michael

Thank you very much. That's one of the most helpful shortcuts that I forgot to write down on my cheat sheet. I appreciate your quick response.