title: Authorize with Permissions
body: <p>I've done the "Getting Started with an ASP.NET MVC 3 Website" using Facebook C# SDK 5.0.8. Everything works fine. </p>
  
  <p>How do I request extra Permissions from the user after that?</p>
  
  <p>When I do <code>[Authorize(Permissions = "offline_access")]</code>, I get 'System.Web.Mvc.AuthorizeAttribute' does not contain a definition for 'Permissions' error.</p>
  
  <p>If I use <code>[FacebookAuthorize(Permissions = "offline_access")]</code>, the page redirects to itself without going to the facebook login page.</p>
  
  <p>Please help!</p>
  
  <p>Thanks</p>