Professional :: Use Keyboard Events To Trigger A Button Rollover Event Instead Of A Mouse?

I created a button that has a movieclip in the rollover state. When you rollover the mouse, the movieclip will animate to appear as if the button will scale from a small to a large button even though it is the movieclip that is playing and not the button itself. But I also want to add a keyboard code to play the rollover instead of the mouse. I learned to write actionscript to play different scenes with the code below, but I'm not sure if I can play a button rollover with the same code.

stage.addEventListener(KeyboardEvent.KEY_DOWN, key_pressed);
function key_pressed(event:KeyboardEvent):void {
if (event.charCode==49) {
gotoAndPlay(1,"scene");
}