Part 4 of my article series on Prism 4 is live here. In this article, I cover the navigation features that were added to regions in Prism 4. These features let you use a loosely coupled URI-based navigation scheme for changing out or activating views within a region. The views (or their view models) can participate in the navigation by identifying if they are the target view for a navigation action, can be notified when they are navigated to with URI parameters, navigated away from. Additionally views (or their view models can decide if they should be navigated away from (such as to prompt the user) and when it should happen.
Read all the details here!