Revised GameOverScreen code

// Game Over screen class
package
{
    import flash.display.MovieClip;
    import flash.display.SimpleButton;
    import flash.events.MouseEvent;
    import flash.text.TextField;
    import flash.ui.Mouse;
    import NavigationEvent;


    public class GameOverScreen extends MovieClip
    {
        public function GameOverScreen()
        {
            Mouse.show(); // show mouse cursor
            restartButton.addEventListener( MouseEvent.CLICK, onClickRestart ); // add click listener to button
            menuButton.addEventListener( MouseEvent.CLICK, onClickMenu); // add menu button listener
        }

        public function onClickRestart(mouseEvent:MouseEvent):void // restarts the game when the restart button is clicked!
        {
            dispatchEvent(new NavigationEvent(NavigationEvent.RESTART));
        }

        public function setFinalScore(scoreValue:Number):void // sets the final score display
        {
            finalScore.text = scoreValue.toString();
        }

        public function onClickMenu(navigationEvent:NavigationEvent):void // brings you back to the menu!
        {
            dispatchEvent(new NavigationEvent(NavigationEvent.MENUSCREEN));
        }
    }
}