Highlight Text / Text Background

This is currently sending my crazy!
I would love if anyone could help me find a way in which I can highlight text in flash.
The css property background-color isn’t accepted by flash.
The text is also going to be dynamic so I can’t just draw it in.
It has to support multi line as well, so simply getting the width of the text box is also a no.

If anyone could help me here it would be greatly appreciated, I am going loco over something so simple!