WPF application using MVVM and PRISM- passing parameters between viewmodels

Check out the Event Aggregator as part of PRISM:

http://msdn.microsoft.com/en-us/library/ff921122%28v=pandp.20%29.aspx[^]

Essentially, you could have View2 subscribe for a specific navigation notification. The events support adding a "payload" value and it uses generics so you can make the payload whatever you need. View1, when the "Next" button is clicked, would then simply raise the event with the specific column id as the payload. Note that you'll have to raise the event AFTER View2 is created and ready (and, more importantly, subscribed to listen for events). If you are using any kind of dependency injection or service locator then this might get a bit tricky due to the timing, but hopefully this gets you on the right track.