Is it possible to expand a movie clip (symbol) with ActionScript in Flash CS4?

For example make a square enlarge itself? Or can you only use a shape tween?Is it possible to expand a movie clip (symbol) with ActionScript in Flash CS4?
yourMovieClip.width = 500;


yourMovieClip.height = 500;





or





yourMovieClip.scaleX = 2;


yourMovieClip.scaleY = 2;