NYC DevReady: MVVM - Session 5 (of 5) - Leveraging MVVM Inside PRISM

Using a Messag Bus to communicate between ViewModels is a very common activity when building an application based on MVVM. In this video, I show how you can build a Message Bus that can be created on a per-page basis and easily connected to the ViewModels on a page using XAML.
For a deeper written explanation of this approach, and to download the source code for the project seen in the video, check out my blog post on Slickthought.net.
Just so everyone is not having to change the xaml in Blend. When you add a object data source it asks you for the key of the object at the top of the dialog window.
Any reason you are not using event aggregators provided by prism?
@Ganesh: Not really. This was more of an effort to illustrate different ways to incorporate XAML and design-time support rather than deal with event routing /messaging per se. PRISM is great, but for a lot of apps it is also overkill so this was just a nice, simple way to get some of the goodness provided by things like Event Aggregator without having to dive into PRISM.