I had the pleasure of presenting a Webcast on Templates and Animation today, and as promised, here is the answer to an open question, and the set of links that were mentioned.
Why couldn’t we animate the Border?
You will remember that I was unable to animate the border thickness in my impromptu demonstration of in-state animation.
Had I looked at the documentation, I would quickly have found that the border thickness is read-only!
Fortunately we were able to animate the opacity which actually gave a more satisfying effect.
Source Code
The complete source code for today’s web cast is available here.

Read the complete post at http://feeds.feedburner.com/~r/JesseLiberty-SilverlightGeek/~3/343781855/templates-and-animation-webcast-follow-up.aspx