Lock Scale

I was through the F1 Help doc a lot yesterday, and I sware I saw something about locking the horizontal or vertical scale of … a movieclip or bitmapdata, I can’t remember. All I know is that would be really useful for me right now! I’m transforming the matrix of an mc, but I don’t want a certain child mc to be scaled.

Anyone know of such a thing? Maybe not for mc, maybe textfields? Thanks.