I will answer here, but we really should move...
"Strip Track <First> +0 (+1, +2, +3, or some variable set before, etc)" and then "Function Select strip". You can also add "Command Move Input Focus to Track View", in case you currently observing some Bus. Unfortunately, the last one is not always working (I guess SONAR bug). But for all purpose except visualization (so auto MIDI input, current context for ACT, etc) "Select strip" is working reliably.
Note that "Select track" has some duality in SONAR. If you mean you not only want to make it current, but also really select it (as clicking on the track number) you should add "Key ','" (comma) in addition (or Shift+',' to extend existing selection).