I was trying out the Flash 9 with Actionscript 3, and when I tried to put some actionscript to a movieclip I created I got this error:

"WARNING: ActionScript 3.0 does not support actions on button or MovieClip instances. All scripts on object instances will be ignored."

Did I do something wrong or can I really not add actionscript to MovieClips? Say I want to make it so that I can move a object around with the arrows keys on my keyboard, how can I do that if I can't add actionscript to the movieclip?