title: WPF blink an ellipse fill animation
body: <p>I was looking at this excellent post:
  <a href="https://stackoverflow.com/questions/1457892/how-do-i-make-an-ellipse-blink">How do I make an ellipse blink?</a>
  Is there a way to not have the blink fade and instead just change the color immediately with no fade?</p>