title: Xcode pin menu for adding Auto Layout constraints is missing
body: <p>In other projects, the menu is not missing.  However, in one project I cannot see or find the menu.  Does anyone know how to make it reappear?  I could not find here or via Google or in the Apple docs, but perhaps I am not looking in the right place.  I am using v6.1, if that matters.</p>
  
  <p>Many thanks!</p>