KeyboardEvent

Hi!

I got problem with this code:

ob.addEventListener(KeyboardEvent.KEY_DOWN, kdown);

function kdown(evt:KeyboardEvent)
{

trace('CLEAR');

    if(evt.keyCode == Keyboard.LEFT)
    {
        ob.x -= 5;
    }

    
    if(evt.keyCode == Keyboard.RIGHT)
    {
        ob.x += 5;
    }

}

I have a MovieClip with Instance name: ob

The function never begins when i press on keyboard.
trace(‘CLEAR’); never begins, can you find the problem?

Thanks //WebbHelp