title: Placing 2 buttons and 1 text field - the constraints are to superview and not siblings
body: <p>In Xcode 6 I am trying to place 2 buttons and 1 text field in 1 column, above each other:</p>
  
  <p><img src="https://i.stack.imgur.com/gh13f.png" alt="Xcode screenshot"></p>
  
  <p>First I select the top button ("Scan...") and set its 3 constraints to 8 pixels:</p>
  
  <p><img src="https://i.stack.imgur.com/BWhd3.png" alt="Xcode screenshot"></p>
  
  <p>This works well.</p>
  
  <p>But when I try the same for the next button ("Connect...") - its top constraint is related to the super view and not to the other button.</p>
  
  <p>I search around in Interface Builder, inspect the constraints properties - but can not find the place to fix that.</p>
  
  <p>Where can I please toggle for a constraint - if it relates to the super view or the sibling?</p>