jquery UI dialog fails with iframe

jquery UI dialog fails with iframe

Hi everybody! =D

I was recently trying to use the jquery UI dialog plugin together with iframes in order to create some sort of "popup windows", but I'm encountering an issue regarding the iframe sizeing, that is, it seems that when the iframe is turned into a dialog by the plugin, it somehow overwrites the width and height that I had set up for it.

you can see what I mean here: http://jsfiddle.net/Xnsq6/4/

as you can notice, I'd like the iframe to fill all the available dialog space, but no matter what widht/height I put, I can't get it right.