Is there a way to programmatically quit my App? (Windows Phone 7)

I'm writing a windows phone 7 app. I have "fatal exception" handling code where I know for sure that the app is totally busted and there's no point in continuing. (I'm hoping I never get here...). Since there's nothing more my app can do other than quit I want the user to be able to close the app.

But I noticed there is no System.Environment.Exit() in the Silverlight 4 SDK for Windows Phone 7. Is there another way to quit the app programmatically?