title: Add constraint not listed in Editor menu in Xcode
body: <p>I am trying to add layout constraints to my NIB, and i am following the directions apple provides here:</p>
  
  <p><a href="http://developer.apple.com/library/ios/#documentation/ToolsLanguages/Conceptual/Xcode4UserGuide/030-Edit_User_Interfaces/edit_user_interface.html" rel="noreferrer">http://developer.apple.com/library/ios/#documentation/ToolsLanguages/Conceptual/Xcode4UserGuide/030-Edit_User_Interfaces/edit_user_interface.html</a></p>
  
  <p>It says this with regards to adding constraints:</p>
  
  <blockquote>
    <p>To add a constraint Select the object or objects for which you want to
    add the constraint.</p>
    
    <p>Choose a constraint from the Editor > Add Constraint menu or an
    alignment type from the Editor > Alignment menu.</p>
  </blockquote>
  
  <p>That Add Constraint menu is no where to be found. What gives? How can i add constraints??</p>