Typewriter follow-up: Accessing the text

In a previous post I asked how to render text letter by letter. Sumo provided a very nice solution with his Typewriter class, which I’m showing here: (Sumo, I replaced the setInterval call with a timer, and added some formatting)

package {
 // @usage: Typewriter(s:String, v:Number, t:TextField)
 // @param: s: String variable for the complete text
 // @param: v: speed in milliseconds, how often the interval is called
 // @param: t: textfield for the string (s)
 import flash.display.MovieClip;
 import flash.events.TimerEvent;
 import flash.text.TextField;
 import flash.text.TextFormat;
 import flash.utils.*;
 public class Typewriter extends MovieClip {
  private var sInt:Number;
  private var count:int;
  private var str:String;
  private var speed:Number;
  private var _textField:TextField;
  private var format:TextFormat;
  private var timer:Timer;
  public function Typewriter (s:String, v:Number, t:TextField):void {
   str = s;
   _textField = t;
   timer = new Timer(v);
   timer.addEventListener(TimerEvent.TIMER, writeIt);
   count = 0;
   _textField.text = " ";
  public function writeIt(e:TimerEvent):void {
   format = new TextFormat();
   format.font = "FFF Alpine";
   format.size = 8;
   format.bold = false;
   format.color = 0x890025;
   _textField.width = 200;
   _textField.height = 500;
   _textField.wordWrap = true;
   _textField.text = str.substring(0, count);
   if (count > str.length) {

Here’s my next problem. After defining my text string t in my .FLA file and passing it to Typewriter thus:

var type = new Typewriter (t.text, 3, t);

… I now want to be able to access t to change formatting (font, bold, etc.). But I cannot get this to work:

t.replaceText(15, 15, "[inserted text]");

What do I need to change to gain access to the text rendered in the Typewriter class?