title: Update constraints menu all greyed out
body: <p>When I try to update constraints in Xcode 6.3, I can't because the menu is completely or partially greyed out.
  <a href="http://hostthenpost.com/uploads/aa150beda71316c338da81c5e301d149.png" rel="nofollow">http://hostthenpost.com/uploads/aa150beda71316c338da81c5e301d149.png</a></p>
  
  <p>Why is this? How do I fix it? The app is a basic, simple Hello World app with two UIImageView elements both sharing heights and widths, and one is constrained 50 from the left, the other 50 from the right. What is wrong with it? How to I make it so I can update the constraints?</p>
  
  <p>Edit: This is when I can see some, but not all of the constraints options.
  <a href="http://hostthenpost.com/uploads/2d8a3bec6a17524d6f9ca1524c95fb0c.png" rel="nofollow">http://hostthenpost.com/uploads/2d8a3bec6a17524d6f9ca1524c95fb0c.png</a></p>