How to add stop button in this code AS3

Question

Hello, im new to this adobe flash AS3. i want to create a simple play sound using flash + XML file for wbesite., this is my code
all this code are working greate.. but i have the problem to add stop_btn code my playlist button already have pause, prevous and next and play.. only stop button i have fail to create. this is my code
var my_songs:XMLList;
var my_total:Number;
var my_sound:Sound;
var my_channel:SoundChannel;
var current_song:Number = 0;
var song_position:Number;
var song_paused:Boolean;
var myXMLLoader:URLLoader = new URLLoader();
myXMLLoader.load(new URLRequest("playlist2.xml"));
myXMLLoader.addEventListener(Event.COMPLETE, processXML);
function processXML (e:Event):void{
var myXML:XML = new XML(e.target.data);
my_songs = myXML.SONG;
my_total = my_songs.length();
function playSong(mySong:Number):void{
var myTitle = my_songs[mySong].@TITLE;
var myArtist = my_songs[mySong].@ARTIST;
var myURL = my_songs[mySong].@URL;
title_txt.text = myTitle;
artist_txt.text = myArtist;
if (my_channel){
my_channel.stop();
my_sound = new Sound();
my_sound.load(new URLRequest(myURL));
my_channel = my_sound.play();
my_channel.addEventListener(Event.SOUND_COMPLETE, onNext);
next_btn.addEventListener(MouseEvent.CLICK, onNext);
function onNext(e:Event):void{
current_song++;
if (current_song>=my_total){
current_song=0;
playSong(current_song);
prev_btn.addEventListener(MouseEvent.CLICK, onPrev);
function onPrev(e:MouseEvent):void{
current_song--;
if (current_song<0){
current_song = my_total-1;
playSong(current_song);
pause_btn.addEventListener(MouseEvent.CLICK, onPause);
function onPause(e:MouseEvent):void{
if (my_channel){
song_position = my_channel.position;
my_channel.stop();
song_paused=true;
play_btn.addEventListener(MouseEvent.CLICK, onPlay);
function onPlay(e:MouseEvent):void{
if (song_paused){
my_channel = my_sound.play(song_position);
song_paused=false;
} else if (!my_channel){
playSong(current_song);
can some one help with me... thank you

Answer 1

stop_btn.addEventListener(MouseEvent.CLICK, onStop);
function onStop(e:MouseEvent):void{
   if (my_channel){
      my_channel.stop();