title: VS2010 add new file throws Set property 'System.Windows.ResourceDictionary.DeferrableContent' threw an exception
body: <p>In Visual Studio 2010, when I right click a project and choose Add new item, the cursor blinks for a second but nothing happens.  If I go File > New > File, I get </p>
  
  <p>Set property 'System.Windows.ResourceDictionary.DeferrableContent' threw an exception</p>
  
  <p>in a dialog box and can't add a new file.</p>
  
  <p>I have Devexpress project templates and when Googling this error, see a few issues related to their WPF components.  I am also using Windows 8 release preview.</p>