IE9 GWT inside IFRAME problem

Hello, we create GWT Google Maps application which is displayed in
IFRAME. So far there wasn't any problem. But problem occurred when new
IE9 was released. So we had to upgrade all GWT libraries to newest
one. Now when I visit our application directly via link:
http://www.geocoder.at/willhaben.at/
everything works fine even in IE9, but when I put this content into
IFRAME like here: http://www.willhaben.at/iad/immobilien/ (map
application is in the middle of page), I'm not able to see our
application. But again there is exception because, when I turn on
compatibility mode with IE8, now I'm able to see content correctly.
Can you tell me how to solve this issue. So far I don't find any
similar bug like I have.

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