You can also download the RatingsDialogBox code and drop it into your project, it will automatically manage the showing of the Ratings dialog for you and also retain settings if the user declined to rate etc.
http://howto.oz-apps.com/2011/03/launch-rating-dialog-in-game.html
http://jayantvarma.github.com/Rating-Dialog-CoronaSDK/
https://github.com/JayantVarma/Rating-Dialog-CoronaSDK
hope that helps your In-App ratings
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