//On navigates to, set mainPage equal to passed in value //Check if front image or side image, set grid background protected override void OnNavigatedTo(NavigationEventArgs e) { mainPage = (FaceImagesPage)e.Parameter; if (mainPage.FaceMode == "Front") { mainGridImageBrush.ImageSource = mainPage.getFrontImage(); } else { mainGridImageBrush.ImageSource = mainPage.getSideImage(); } }