title: as3 change properties of TextFormat
body: <p>I have a dynamic text box that gets its text from the database. The size of the text is depended on the number of characters in the string I recieve. For example, if I get a 24 chars string (which is the maximum in our database), the text size should be 17p, if I get a 23 chars string, the size should then be 18p and so on.
  I could create many textFormat instances for each combination, but that wouldn't be elegant.
  If I have this on my code:
      var defaultFmt:TextFormat = new TextFormat();
      defaultFmt.font = "Comic Sans MS";
      defaultFmt.size = 30;
      defaultFmt.align = TextFormatAlign.CENTER;
  can I later change the size?</p>