I think this is a little problem for you. So I hope it would not waste your time too much.
I built a Facebook Application with Adobe Flex by using facebook-actionscript-api. In production, they use SWFObject for embed Flash content in HTML page.
The problem is, it looks like SWFObject have a problem with FireFox and some browser. So even I set my application’s height to 1000px, the Facebook clipped my Flash content to its minimum size. sometime it shows scroll bar.

Do you have any suggestion, or workaround on this problem?
I think that you will have to use FB.setCanvasSize() besides SWFObject in order to re-scale it properly.