title: C# Can't generate task based operations using service reference
body: <p>When I'm adding a service reference in Visual Studio Express 2012 for Windows Phone I can't choose the option "generate task based operations". I can't even uncheck the Allow generation of asynchronous operations checkbox.</p>
  
  <p>I'm using the following address: <a href="http://www.webservicex.com/globalweather.asmx?wsdl" rel="nofollow">http://www.webservicex.com/globalweather.asmx?wsdl</a></p>
  
  <p>Screenshot: <a href="http://snag.gy/sLjrg.jpg" rel="nofollow">http://snag.gy/sLjrg.jpg</a></p>
  
  <p>I'm missing something?</p>