Oooh, this is a tough cookie.
There is the bounds property, but unfortunately it is read-only. What I suggest is this: Align both arrays to bottom, and make them display the same number of elements (2-4 is good). Now, start making the bottom boolean bigger one or two pixels at a time (drag it upward, so the array grows that way). Eventually, you should get it the right size. But now you have a problem - this setup is font-dependant. If you run this somewhere else it can be easily changed, so it's dangerous. A safe solution would be to use a cluster array. Make a cluster from a string and a boolean and drag this cluster into an empty array. You'll have to change your code, but they'll always be aligned.
___________________
Try to take over the world!