private void Setup() { if (!_firstRun) { return; } _firstRun = false; var shadowContainer = ElementCompositionPreview.GetElementVisual(ImageContainer); var compositor = shadowContainer.Compositor; var image = ImageContainer.FindChildren <CompositionImage>().First(); var imageVisual = image.SpriteVisual; var imageLoader = ImageLoaderFactory.CreateImageLoader(compositor); var imageMaskSurface = imageLoader.CreateManagedSurfaceFromUri(new Uri("ms-appx:///Helpers/Composition/CircleMask.png")); var mask = compositor.CreateSurfaceBrush(); mask.Surface = imageMaskSurface.Surface; var source = image.SurfaceBrush as CompositionSurfaceBrush; var maskBrush = compositor.CreateMaskBrush(); maskBrush.Mask = mask; maskBrush.Source = source; image.Brush = maskBrush; Shadow.Mask = maskBrush.Mask; this.Fade(value: 1, delay: 1000).StartAsync(); }