private void OnLoaded(object sender, RoutedEventArgs e)
{
_compositor = Window.Current.Compositor;
_generator = _compositor.CreateCompositionGenerator();
_imageVisual = _compositor.CreateSpriteVisual();
_imageVisual.Size = new Vector2(RenderGrid.Width.ToSingle(), RenderGrid.Height.ToSingle());
_imageOptions = ImageSurfaceOptions.DefaultOptimized;
_imageOptions.SurfaceBackgroundColor = Colors.Black;
_imageSurface = _generator.CreateImageSurface(null, _imageVisual.Size.ToSize(), _imageOptions);
_imageVisual.Brush = _compositor.CreateSurfaceBrush(_imageSurface);
ElementCompositionPreview.SetElementChildVisual(RenderGrid, _imageVisual);
ImageCB.SelectedIndex = 0;
StretchCB.SelectedIndex = 0;
AlignXCB.SelectedIndex = 1;
AlignYCB.SelectedIndex = 1;
}