AS3 Implementing Keyboard Controls

package 
{
	import flash.display.MovieClip;
	import flash.events.KeyboardEvent;
 
	/********************************************************************
	* Description : This is the main document Class file.
	* @author Alex T.
	 ********************************************************************/
	public class  Main extends MovieClip
	{
		public var mcCursor:MovieClip;
		public var MCCURSOR_X:int = 150;
		public var MCCURSOR_Y:int = 150;
 
		public function Main( ) {
			resetCursorPosition();
			// Attaching stage keyListeners to listen to keyboard input 
			stage.addEventListener(KeyboardEvent.KEY_DOWN, handleKeyDown );
		}
 
		private function handleKeyDown( event:KeyboardEvent ):void {
			// This is where we handle what to do when there's an input
                        // event.keyCode returns a keyCode of the particular keyboard key.
			// trace( "KeyCode received : " + event.keyCode ) ;
			switch (event.keyCode) {
				case 32:
					      // Spacebar is pressed. Enables recentering.
					      resetCursorPosition();
				break;
 
				case 37:
					      // key left
                                              mcCursor.x = mcCursor.x - 2;
				break;
 
				case 38:
					      // key up   	
                                              mcCursor.y = mcCursor.y - 2;
				break;
 
				case 39:
                                              // key right						
                                              mcCursor.x = mcCursor.x + 2;
				break;
 
				case 40:
					      // key down						
                                              mcCursor.y = mcCursor.y + 2;
				break;
			}
		}
 
		private function resetCursorPosition():void {
			mcCursor.x = MCCURSOR_X;
			mcCursor.y = MCCURSOR_Y;
		}
	}
}