title: Flash Dynamic Text Width
body: <p>Hey! I try to find out the text size of a textfield in the following example</p>
  
  <pre><code>field.text = 'aaaaaaa';
  trace(field.textWidth);
  
  setTimeput(function(){
     field.text = 'aa';
     trace(field.textWidth);
  },2000)
  </code></pre>
  
  <p>The number is always the same. Why?
  I need the text width so I can adjust size for a background movieclip.
  Thx!</p>