AS3 Typewriter Class

After doing some searching, I found this typewriter class at Justin Scrader’s blog. While this is exactly what I need, my question is it possible to move the codes to my existing class? Because I already dynamically added textfields via codes and applied css from an external file, but he added textfields to his stage. So I’m just wondering if this is doable? Any pointers on how to do this?

This is my codes:

package com {
    import flash.display.MovieClip;
    import flash.text.StyleSheet;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    public class About extends MovieClip {
        var loader:URLLoader;
        var field:TextField;
        private var aboutText:String = "<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas semper ligula dui. Fusce nibh magna, fermentum vel hendrerit eu, tincidunt a neque. Integer vehicula rutrum velit, non elementum ligula vulputate id. Nullam hendrerit viverra viverra. Nunc rutrum ultricies metus mattis vestibulum. Donec elementum tempor lacinia. Etiam lacinia odio sed risus convallis ultrices. Sed sit amet arcu sed lacus dapibus lobortis. Nullam euismod nisl et arcu mollis eget mattis lorem malesuada. Vestibulum iaculis sagittis ultricies. Quisque dui mauris, laoreet vel pretium et, porttitor a massa. Vivamus sed felis tristique dolor luctus interdum. Morbi non nisl sed ante scelerisque iaculis porttitor nec enim. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Aliquam imperdiet egestas magna et dapibus. Nulla a urna lectus.</p>"
  public function About():void {
        field = new TextField();
        field.width = 800;
        field.autoSize = TextFieldAutoSize.LEFT;
        field.wordWrap = true;
        field.selectable = false;
        var req:URLRequest = new URLRequest("about.css");
        loader = new URLLoader();
        loader.addEventListener(Event.COMPLETE, onCSSFileLoaded);
  public function onCSSFileLoaded(event:Event):void {
        var sheet:StyleSheet = new StyleSheet();
        field.styleSheet = sheet;
        field.htmlText = aboutText;