What causes Visual Studio 2008 SP1 to crash when switch to Design View of a WPF application

Question

After developing a WPF application without Source Control, I decided to add the solution to TFS.

After doing so whenever I opened the main window.xaml file in Design

Answer 1

I didn't have PowerCommands installed, but had the same problem. Starting in safe mode and deleting any exotic tabs in the toolbox solved the problem (you can start in normal mode afterwards). This is one of many possible causes of this error, as some Googling will show you.