MVVM- View Model-View Model Communications

Question

How do I go about having two view models communicate with one another using MVVM Light. I know how to use the messenger class and register etc.. Here is my Scenario

Answer 1

I second Nigel's suggestion of using the Mediator, take a look at Josh Smith's blog and his implementation of this:

http://joshsmithonwpf.wordpress.com/?s=mediator

At the bottom you can download the Mediator Prototype and Demo, just remember to rename it from .doc to a .zip.

Hope this helps...