KeyboardEvent.KEY_DOWN doesn't register for all keys

programming flash
1

This is a weird problem I have been experiencing, the code at the end of my post only registers certain keys like ‘D’, ‘G’ , all numeric keys,etc but not any other letters…
The code is directly from flash cs3 help.

package {
import flash.display.Sprite;
import flash.display.DisplayObject;
import flash.events.*;

public class test extends Sprite {
    private var bgColor:uint = 0x00CCFF;
    private var size:uint = 80;

    public function test() {
        var child:Sprite = new Sprite();
        child.graphics.beginFill(bgColor);
        child.graphics.drawRect(0, 0, size, size);
        child.graphics.endFill();
        addChild(child);
        stage.focus = child;
        child.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler);
        child.addEventListener(KeyboardEvent.KEY_UP, keyUpHandler);
    }

    private function keyDownHandler(event:KeyboardEvent):void {
        trace("keyDownHandler: " + event.keyCode);
        trace("ctrlKey: " + event.ctrlKey);
        trace("keyLocation: " + event.keyLocation);
        trace("shiftKey: " + event.shiftKey);
        trace("altKey: " + event.altKey);
    }

    private function keyUpHandler(event:KeyboardEvent):void {
        trace("keyUpHandler: " + event.keyCode);
    }
}

}