Visual Studio 2008 Xaml Editor not working / disappeared

Question

When I start up VS 2008 to work on a WPF / Silverlight App and open a XAML or XML file the XAML / XML editor is no longer working. The designer does not show up and intelli

Answer 1

I've seen this problem before, running this command should fix it :

Devenv.exe /ResetSkipPkgs