facebook FB.ui feed dialog customize option not working

I have a facebook app which has feed dialog link. on Clicking the link the feed dialog opens up. I try to customize the friends who shall be able see the wallp开发者_StackOverflowost. This opens up the custom privacy dialog, but closes the feed dialog. So I cannot move forward with the wall post.

This happens when: The app is being used as a page tab AND The display mode is iframe.

This does not happens if: The app is being used as an app (apps.facebook.com/app_name) OR The display mode is popup.

Please advice...

there is currently a bug in facebooks feed dialogs and the privacy dropdown... facebook should sort this out soon. In addition, you should report this issue here.