Detecting when the app is not visible (behind start screen, etc)

What is a good mechanism to detect when an application is behind a start screen (or loaded, but not visible?)

use:
CoreWindow.GetForCurrentThread().Visible and
CoreWindow.GetForCurrentThread().VisibilityChanged;
event
Microsoft Certified Solutions Developer - Windows Store Apps Using C#

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Detecting when the app is not visible (behind start screen, etc)

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