Hello, today I have downloaded C#/XAML for HTML5 after many years as a WPF & Silverlight developer. Basic question please: when I open the Calculator or Showcase project in VS2012, the designer pane just shows the error "MainPage.xaml cannot be edited in the Design view". I understand from browsing these forums that this should preview the page, even if you can't use the toolbox. One answer suggests that the WPF designer is being invoked by mistake.
Any idea how to diagnose or resolve this?