private void NavigatorHighlightImage_MouseDown(object sender, MouseButtonEventArgs e)
 {
     if (e.LeftButton == MouseButtonState.Pressed)
     {
         CurrentPosition   = e.GetPosition(this);
         bTranslatingImage = true;
         NavigatorHighlightImage.CaptureMouse();
     }
 }
 private void NavigatorHighlightImage_MouseUp(object sender, MouseButtonEventArgs e)
 {
     bTranslatingImage = false;
     NavigatorHighlightImage.ReleaseMouseCapture();
 }