AS3.0 TextField Mouse Scroll

This is a question about textfield mouse scrolling
I have multiple lines of text in a textfield of constant size.
If the number of lines of text exceeds the range of the text field
I can not scroll above the text title, but only I can scroll in the empty space next to the text title
Can you please tell me how to make the text scrollable above the title?
Thank you so much

completed => Music Played List
sm => Music List
n => Muic List Array Number
indexNo => Music Played Title Array Number
playedList => textField (Dynamic)

completedList();

var tHeight: Number;
function completedList(): void {

	if (completed.length == 0) return;

	var tx: String;
	var addTx: String;

	tHeight = playedList.textHeight;
	var t2: Number = tHeight / 2;
	var lines: uint = Math.floor((playedList.height - t2) / tHeight);

	for (var i: uint = 0; i < completed.length; i++) {
		tx = (i <  9) ? String("  " + (i + 1)) : String(i + 1);
		tx = (i == 0) ? String(" "  + (i + 1)) : tx;

		addTx = tx + " - " + completed[i] + "\n";
		playedList.appendText(addTx);
		if (playedList.numLines > lines) {
			playedList.scrollV++;
		}
	} 
	if (playedList.numLines > lines) {
		playedList.border = true;
		playedList.borderColor = 0x003366;
	}
	playedList.addEventListener(MouseEvent.CLICK, selectTextFieldLine);
	this.addChild(playedList);
}

function selectTextFieldLine(e: MouseEvent): void {

	var index: uint = playedList.getLineIndexAtPoint(e.localX, e.localY - (tHeight / 2 / 2));

	if (index >= (playedList.numLines - 1)) return; 
	if ((index != -1) && (indexNo[index] != n)) {
		n = indexNo[index];
		musicPlay(sm[n]);
	}

}