You hit a key combination and it opens the align screen. Just be careful when you pull your phone out and it won't happen.
Edit: I searched (lol) and found this.
http://forum.ppcgeeks.com/showthread.php?t=89151
"To access the screen align mode on the Touch Pro 2 you press volume up and volume down at the same time then while those are still pressed tap the screen. This will bring up the alignment screen."
so the volume up and down are pressed and then the screen gets bumped and the align screen shows.
Also 2 more
http://forum.ppcgeeks.com/showthread.php?t=92955
http://forum.ppcgeeks.com/showthread.php?t=79931