scrollbars randomly appears in facebook iframe app

Question

Hi,

I'm developing a facebook platform app based on the tedious iframe.

One thing I very can't figure out is why scrollbars appears randomly in the iframe.

I tried using:

FB.Canvas.setAutoResize();

and

FB.Canvas.setSize();

in the

window.fbAsyncInit = function() {}

It seemed this was the trick, but it wasn't.

Anyone experienced the same strange behavior?