Flyout behind Appbar
问题 When you want your app to expand to the full screen (including status bar and appbar), you have to do : var applicationView = Windows.UI.ViewManagement.ApplicationView.GetForCurrentView(); applicationView.SetDesiredBoundsMode(Windows.UI.ViewManagement.ApplicationViewBoundsMode.UseCoreWindow); Then if you want to have a flyout in your appbar or anywhere in your app, they will be displayed behind the appbar : <Page.BottomAppBar> <CommandBar> <AppBarButton Icon="Preview" Label="Preview">