I think the problem may be that you're not closing the track 1 staff view before opening the (supposed) track 2 staff view.
If you're working in the staff or PRV and don't close it, then go to the track view, click on another track and then the staff/PRV view, the already-open staff will appear instead of the new track staff.
That's been my experience with MC 2003, MC Pro 24 and SONAR Home Studio 6.
But, you can also have multiple tracks showing in the staff. Just click the Show Tracks icon and select the tracks you want to work on while holding down the computer keyboard's Ctrl key. Notes entered in one will be associated with that track unless your notes are too low or high in the staff, in which case they may play in the other track.
Older version instructions; MC 6 and X1 may have different ways to do that.