title: How can I overlay one image onto another?
body: <p>I would like to display an image composed of <strong>two</strong> images.</p>
  
  <p>I want image <strong>rectangle.png</strong> to show with image <strong>sticker.png</strong> on <strong>top</strong> of it with its <strong>left-hand</strong> corner at pixel 10, 10.</p>
  
  <p>Here is as far as I got, but <strong>how do I combine the images?</strong></p>
  
  <pre><code>Image image = new Image();
  image.Source = new BitmapImage(new Uri(@"c:\test\rectangle.png"));
  image.Stretch = Stretch.None;
  image.HorizontalAlignment = HorizontalAlignment.Left;
  
  Image imageSticker = new Image();
  imageSticker.Source = new BitmapImage(new Uri(@"c:\test\sticker.png"));
  
  image.OverlayImage(imageSticker, 10, 10); //how to do this?
  
  TheContent.Content = image;
  </code></pre>