Depending upon the Dependency properties

Going through Avalon a new area of Avalon opened before me, "The Dependency Property System".Dependency properties are properties that are registered with the "Avalon" dependency property system. There are two typoes of Dependency Properties
1. By backing your common language runtime property with a dependency property. This Includes support for styling, databinding, animation, default values, value expressions, property invalidations, or inheritance.
2. Attached properties are properties that can be set By the child or contained element for/of its parent or Container Object.

This Dependency property system is the core component for the Avalon. I personally really adored this approch of microsoft.