title: fb-request-form-submit in iFrame page tab problem
body: <p>I created iFrame application for Sending invites to friends to join on my page. Every FB visitor can send invites to their friends. Selecting friends is working fine but after clicking button Send invite it opens fb-request-form-submit in a way it is just half seen (one part is missing). 
  I believe it is connected with the fact that page tab has 520px width limit and fb-request-form-submit is more than 520 px so when within iFrame it doesn't pop-ups in a correct way.
  How to resolve that?</p>
  
  <p>On another FB page I have FBML tab with pure FBML code and there is working OK so it must be something with iFrame...</p>