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Indicates that the Page is about to cease displaying.
public event EventHandler Disappearing;
member this.Disappearing : EventHandler
Disappearing is raised when the page disappears due to navigating away from the page within the app. It is not raised when the app disappears due to an event external to the app (e.g. user navigates to the home screen or another app, a phone call is received, the device is locked, the device is turned off).