AS 3.0 textField

When you click the music button, the list of played music is listed on the right.
How to select one of them and play it again...
And if the list has more textfield, you can scroll.
I would like to know how

* It's Google translation, so please understand if it's not enough

thank you

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var channel:SoundChannel;
var pausePosition:Number;
var sound:Sound;
var ptrans:SoundTransform;
var n:uint;
var p:uint;
var v:uint = 0;
var count:uint = 0;
var loopCount:uint = 0;
var completed:Array = [];

sm.sort();

for (var i:uint=0; i < sm.length; i++) {
cb.addItem({label:sm[i],data:i});
}

// Music Start ===================================================

function music_start(url:String):void {

if (channel) { channel.stop(); }

n = p = sm.indexOf(url);

url = dm + url + ".mp3";
var mySound:Sound = new Sound(new URLRequest(url));
var myChannel:SoundChannel = new SoundChannel();

myChannel = mySound.play(0);

sound = mySound;
channel = myChannel;

channel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);

}

var delayTimer:Timer = new Timer(500, 1);

function soundCompleteHandler(event:Event):void {
delayTimer.addEventListener(TimerEvent.TIMER, indexReplay);
delayTimer.start();
}

function indexReplay(event:TimerEvent):void {
completed.push(sm[n]);
if (completed.length>22) completed.shift();

if ((listOK) && (completed.length > 0)) {
textList.text = String(" ");
completedList();
}

music_start(sm[n]);

}

pList_btn.addEventListener(MouseEvent.CLICK,completedListOK);
pList_btn.buttonMode = true;
pList_btn.gotoAndStop(1);
var listOK:Boolean = false;

function completedListOK(evt:MouseEvent):void {
listOK = !listOK;
if (listOK) {
pList_btn.gotoAndStop(2);
completedList();
} else {
pList_btn.gotoAndStop(1);
textList.text = String(" ");
}

}
function completedList():void {

var tx:String;
var addTx:String;
for (var i:uint=0; i<completed.length; i++) {
tx = (i<9) ? String(" "+(i+1)) : String(i+1);
addTx = tx+ " - "+completed[i]+"\n";
if (i==0) textList.appendText(" ----- Music Played List ----- \n");
textList.appendText(addTx);
}

}