Whilst working through the hands-on lab "Get Started with the Prism Library", I follow the instructions to add a region in the Shell.xaml file...
1) Add the Prism namespace:
2) Replace the Grid with an ItemsControl and define a region:
<ItemsControl Name="MainRegion" prism:RegionManager.RegionName="MainRegion"/>
But this throws up the error "Error 2 The attachable property 'RegionName' was not found in type 'RegionManager'."
Any ideas what's wrong?