Kirupa Chinnathambi will teach you how to make easier the process of writing behaviors.
Behaviors make it easier for designers to be able to do cool things that would otherwise require writing code. Of course, a behavior doesn’t just magically appear out of thin air.* It requires someone actually writing it.
While one our goals was to make it easy for someone to write a Behavior, there is a certain amount of boilerplate code that you need to be aware of before you get to writing code that is more familiar to you. To help make that process easier, we are going to be providing Item Templates that can be accessed from both Expression Blend 3 as well as Visual Studio 2008.