With some help from Shawn Oster – I had the BindableApplicationBar published on NuGet. Now there is no need to search for sources or assemblies on CodePlex if you need to quickly create an MVVM-friendly ApplicationBar. Just right-click on your project and select “Manage NuGet Packages…”
Then search for appbar, install it and voila! You can now use the BindableApplicationBar.