private void UserDrawWPF(DrawingContext dc)
        {
            if (bFound == true)
            {
                VMMainViewModel.Instance.ConvertCoordGroundToPixel(fx, fy, ref PixelX, ref PixelY);
                RectAnimationUsingKeyFrames n = new RectAnimationUsingKeyFrames();
                n.Duration       = TimeSpan.FromMilliseconds(700);
                n.RepeatBehavior = RepeatBehavior.Forever;
                n.AutoReverse    = true;
                n.KeyFrames.Add(
                    new LinearRectKeyFrame(
                        new Rect(new Point(PixelX - 40, PixelY - 40), new Size(80, 80)), // Target value (KeyValue)
                        KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(350)))            // KeyTime
                    );

                n.KeyFrames.Add(
                    new LinearRectKeyFrame(
                        new Rect(new Point(PixelX - 25, PixelY - 25), new Size(50, 50)), // Target value (KeyValue)
                        KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(700)))            // KeyTime
                    );

                Rect           rect    = new Rect(new Point(PixelX - 25, PixelY - 25), new Size(50, 50));
                AnimationClock myClock = n.CreateClock();


                BitmapImage b = new BitmapImage();
                b.BeginInit();
                b.UriSource = new Uri("pack://application:,,,/images/Sight.png");
                b.EndInit();



                dc.DrawImage(b, rect, myClock);
            }
        }