UIElementImageShot

            MemoryStream memStream = new MemoryStream();
            System.Windows.Media.Imaging.RenderTargetBitmap bmp = new System.Windows.Media.Imaging.RenderTargetBitmap((int)panel.ActualWidth, (int)panel.ActualHeight, 96d, 96d, System.Windows.Media.PixelFormats.Pbgra32);
            bmp.Render(panel);
            System.Windows.Media.Imaging.JpegBitmapEncoder encoder = new System.Windows.Media.Imaging.JpegBitmapEncoder();
            encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(bmp));
            encoder.Save(memStream);
            byte[] bt = memStream.ToArray();
            memStream.Close();

            memStream = new MemoryStream(bt);
            BitmapImage biImg = new BitmapImage();
            biImg.BeginInit();
            biImg.StreamSource = memStream;
            biImg.EndInit();

            ImageBrush brush = new ImageBrush();
            brush.ImageSource = (ImageSource)biImg;
            imagePanel2.Background = brush;