Visual Studio 2015 C# XAML Designer doesn't load

Question

In the new Visual Studio 2015 RC the XAML designer does not bring up a UI for a C# Windows Universal project but it does for a C++ Windows Universal project. This occurs wi

Answer 1

Windows 10 (fresh install + Developer mode) VS 2015 Update 1 Ultimate SDK Build 10586 By default no designer being available even via Shift-F7.

This expands the scope of the original problem, its not a VS edition based issue at all. Its a problem with the SDK support.

AS per Wener Henze

Swtich back to Build 10240. Fixed. Designer now available.

Werners workaround is confirmed and saved me lots of time. I don't have the rep to thank him, or comment on his post directly.