Keyboard Listener won't listen?

Hello,

I’m having a bit of trouble with the keyboardEvent.KEY_DOWN event listener. I’m not getting any errors, flash seems to be just ignoring that listener altogether. I’ll paste my code below, if anyone could help, that’d be great!


package
{
	import flash.display.MovieClip
	import flash.events.*
	public class hotAirBalloon extends MovieClip
	{
		public function hotAirBalloon()
		{
			this.y = 300
			this.x = 80
			this.addEventListener(KeyboardEvent.KEY_DOWN,keyboardListener)
		}
		private function keyboardListener(event:KeyboardEvent)
		{
			trace(event.keyCode)
		}
	}
}