me personally I wouldn't do with a popupoverly using windowmanager, but have something on the shell of your Wp8 that can popup based on an event sent from IEventAggregator? All it would is some border or grid with an opacity and a textblock. AppBar is appbar it might work this case to have the overlay at such a location that it will cover the appbar or use BindableAppbar and tell it to be hidden (design choice?).
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