protected override void OnNavigatedTo(NavigationMode mode, IDictionary <string, string> parameter, bool isNavigationInitiator)
 {
     base.OnNavigatedTo(mode, parameter, isNavigationInitiator);
     State         = "Test1: Navigated";
     Callback      = HandleOrientation;
     PartViewModel = new PartViewModel();
 }
 protected override void OnNavigatedTo(NavigationMode mode, IDictionary<string, string> parameter, bool isNavigationInitiator)
 {
     base.OnNavigatedTo(mode, parameter, isNavigationInitiator);
     State = "Test1: Navigated";
     Callback = HandleOrientation;
     PartViewModel = new PartViewModel();
 }