can't get the OpenGraph properties working in an iframe canvas of a Facebook app

I can't get the opengraph properties working in an iframe canvas of a Facebook app.

I开发者_开发知识库 used the Facebook URL Linter to test.

What I did to slim the problem down:

1) create an HTML page (test.html) with OG properties

--> works.

2) When I 'add' this page as an iframe to another page (frame.html).

--> No OG properties found.

How to solve this problem?

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Use the solution here: http://forum.developers.facebook.net/viewtopic.php?pid=354148#p354148 It worked for me