title: setAutoGrow to set canvas length
body: <p>I was trying to implement fluid canvas for my facebook app. I am using the script</p>
  
  <pre><code>window.fbAsyncInit = function() {
  FB.Canvas.setAutoGrow();
  }
  </code></pre>
  
  <p>just after i initialize my app but it is still set to 800px. How should i use this function?</p>