It's been a long time since I have actively used SONAR, and have not bothered with CbB, but there was a setting in the settings menu, something like 'recycle plugin windows' check that out. also there is the 'pin' at the top right of plugin windows i think, then I think you can also hold either Ctrl or Shift (
can't recall which) while clicking on the next plugin you wish to open. Like I said, it's been a long time, but if my memory isn't failing that should get you there.