crosshair can shoot but sound effect doesn't work

hi all i'm new to adobe flash cs6.  I want to create some shooting games here, but i've got some problem

i Have my action script like this :

import flash.events.Event;

import flash.events.MouseEvent;

addEventListener(Event.ENTER_FRAME,aaa);

function aaa(e:Event)

{

    crosshair.x = mouseX;

    crosshair.y = mouseY;

}

Mouse.hide();

movie1.addEventListener(MouseEvent.CLICK,bbb);          /*movie1 is the enemy*/

function bbb(e:MouseEvent)

{

    trace("Win");

}

crosshair.addEventListener(MouseEvent.CLICK,pistolShot);

function pistolShot(e:MouseEvent)

{

    var s:PistolSound = new PistolSound();

    s.play();

}

crosshair.mouseEnabled = false;

i want to my crosshair play the sound effect when it click.

When I remove this code:

crosshair.mouseEnabled = false;

crosshair can play the sound effect but I cannot shoot the enemy.

I can shoot the enemy with the code but it won't play the sound effect.

what code should I use?

thank you