FB.Canvas.setSize() not works
===

Resizing app frame does not work for me.

Here is piece of my code:

     window.fbAsyncInit = function() {
      FB.init({
        appId      : xxx
        channelUrl : '//channel.html',
        status     : true,
        cookie     : true,
        xfbml      : true
      });

      FB.Canvas.setSize({height: 8000});

Unfortunately, setSize do nothing. My canvas has still a initial height. 
In app settings i have:
Canvas Height: Fixed at 800px.

