what do you mean by "larger". Horizontal or vertical?
these properties should do the trick:
But if you check livedocs, you will see that these are the default values. SO if this was causing the problem, you will have to find something similar to these lines, and replace it.
If this is not the problem, would it be possible to show an example, or upload a zip with all the fla files. i'll take a look
UnrealEd