Silverlight 5 has another new feature called Ancestor Relative source binding. It was already available in WPF and has been newly introduced in Silverlight 5 beta. Using this, you can now bind to the relative ancestor elements very easily.
Let's discuss it with a small example where we will create a Control Template for a Button and bind it's Tag property to the actual element to display text, instead of setting the Content property. Read to know more.