private void image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            ImgGraph.CaptureMouse();
            var tt =
                (TranslateTransform)
                ((TransformGroup)ImgGraph.RenderTransform).Children.First(tr => tr is TranslateTransform);

            _start  = e.GetPosition(Border);
            _origin = new Point(tt.X, tt.Y);
        }
 private void image_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
 {
     ImgGraph.ReleaseMouseCapture();
 }