Copiar texto de un texto field con Enter

/**
 * Code by rodrigolopezpeker (aka 7interactive™) on 1/29/14 12:40 PM.
 */
package labs {
import flash.display.Sprite;
import flash.events.TextEvent;
import flash.text.TextField;
import flash.text.TextFieldType;
import flash.text.TextFormat;

[SWF(width="400", height="100", backgroundColor="#323232", frameRate="60")]
public class LabMain extends Sprite {

    private var input_tf:TextField;
    private var textarea_tf:TextField;

    public function LabMain() {
        init();
    }

    private function init():void {
        input_tf = addTF(TextFieldType.INPUT, 0xffffff);
        textarea_tf = addTF(TextFieldType.DYNAMIC, 0xdedede);
        input_tf.defaultTextFormat = new TextFormat('Arial', 12, 0x565656);
        textarea_tf.defaultTextFormat = new TextFormat('Arial', 12, 0x0);
        textarea_tf.x = 200;
        input_tf.addEventListener(TextEvent.TEXT_INPUT, handleTextChange);

        stage.focus = input_tf;
    }

    private function addTF(p_type:String, p_bgColor:uint):TextField {
        var tf:TextField = new TextField();
        tf.border = true;
        tf.type = p_type;
        tf.width = 200;
        tf.borderColor = 0x0;
        tf.background = true;
        tf.multiline = true;
        tf.backgroundColor = p_bgColor;
        addChild(tf);
        return tf;
    }

    private function handleTextChange(event:TextEvent):void {
        var tf:TextField = event.currentTarget as TextField;
        if (event.text == '\n') {
            if (tf.selectedText) {
                event.preventDefault();
                sendText(tf.selectedText);
            }
        }
    }

    private function sendText(p_text:String):void {
        textarea_tf.text += p_text + '\n';
        textarea_tf.scrollV = textarea_tf.maxScrollV;
    }
}
}