title: FB ios SDK - 3.0+ - How can I add permission to [FBSession.activeSession openWithBehaviour: completionHandler]?
body: <p>since I don't want the fallback flow starts with iOS6 login dialog, I used </p>
  
  <pre><code>[FBSession.activeSession openWithBehaviour: completionHandler] 
  </code></pre>
  
  <p>but wonder where I can add the permission parameters, just like <code>@"basic_info"</code> and <code>@"user_like"</code> in the following method-</p>
  
  <pre><code>[FBSession openActiveSessionWithReadPermissions:@[@"basic_info", @"user_like"]
                                 allowLoginUI:YES
                            completionHandler:^(FBSession *session,
                                                FBSessionState status,
                                                NSError *error) {
                                // Respond to session state changes, 
                                // ex: updating the view
                            }];
  </code></pre>
  
  <p>Thanks for any advice. </p>