Incrementing the size of dynamic text

I’m making a part of a text field larger. As these couple of characters increase, I want the size of the other type to stay the same. Believe me, I didn’t order this.

I’ve found two problems.

  1. you can’t increase the size of letters within a dynamic text field individually. In other words, you increase two letters, the whole thing increases.

and

  1. the baseline of the text goes downward. So when you increase two letters in a static text box (to combat the problem 1), the text shifts downward baseline wise instead of maintaining the baseline and growing larger upward. I know it’s tough to describe. Essentially, I can’t “pin” the text to its baseline.

Someone please tell me there’s a way with actionscript to lock a text box to the stage and as the two numbers increase in size, the text that follows shifts right and upwards, maintaining the baseline position without resorting to tweening and shifting with the up arrow. Ugh.