title: Can't make unit testing works in xamarin studio
body: <p>I'm trying to follow this tutorials:</p>
  
  <p>www.codeproject.com/Articles/34161/Setup-a-Test-Project-with-NUnit-and-MonoDevelop</p>
  
  <p>but when i click "Run tests", they are gray and no results showed:</p>
  
  <p>screenshot:
  <a href="http://img585.imageshack.us/img585/8003/111vuq.png" rel="nofollow">http://img585.imageshack.us/img585/8003/111vuq.png</a></p>
  
  <p>how can I make them work ?</p>