private static void HWNDOwnerChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            D3D11D3DImage image = sender as D3D11D3DImage;

            if (image != null)
            {
                if (image.Helper != null)
                {
                    image.Helper.HWND = (IntPtr)args.NewValue;
                }
            }
        }
        private static void RenderChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            D3D11D3DImage image = sender as D3D11D3DImage;

            if (image != null)
            {
                if (image.Helper != null)
                {
                    image.Helper.RenderD2D = (Action <IntPtr>)args.NewValue;
                }
            }
        }