Navigating in Caliburn.Micro WP7

I'm using Caliburn Micro to build a WP7 app at the moment, and I had an issue using the INavigationService to navigate to a page.

It seemed like a fairly straightforward requirement, to go from Page 1 to Page 2, so I knew I must be doing something wrong.

The cool thing about OSS, is that you get the source code! I did a little digging, and this is what I found

Hope this helps anyone making the same mistake as me.