title: What does factoryClass mean in AS3?
body: <p>Got these lines while working in a project automatically created by Flash Develop.
  Not able to figure out what does this <code>[Frame(factoryClass) = "xxxx"]</code>  mean..</p>
  
  <pre><code>[Frame(factoryClass = "app.Preloader")]
  </code></pre>
  
  <p>What syntax is it following ? Is it any type of array index .. what is it ? </p>