Monotouch - fast app switching

How is the above implemented in MT? How do I allow the app to open back up to the screen it was last seen in? 开发者_StackOverflow社区

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All you need to do is compile your application with the SDK 4.0. The new SDK automatically enables fast app switching, there's nothing you need to do from a code standpoint.

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To complement Eduardo's answer, you need to compile using the 4.0 SDK, but make sure that in the iPhone Build tab on your project properties you explicitly set the version to 4.0 (chances are, it is still 3.1 from the previous version).