title: Change windows phone 7 silverlight project namespace causes start fail
body: <p>I try to change refactor and change default namespace:</p>
  
  <p>Hightlight namespace in MainPage.xaml.cs -> Right click -> Refactor -> Rename
  Enter new namespace name and apply for all finded. That change Default namespace in project preferences too.</p>
  
  <p>But after that my project doesn't starts.</p>
  
  <p>How do I change my namespace correctly?</p>