title: How to add a height/width constraint with iOS Designer in Xamarin Studio?
body: <p>As the title indicates I want to add a constraint like with Xcode with the <em>Pin</em> button, but there is no such button in Xamarin Studio. I can't figure out where do I add a height constraint.</p>
  
  <p>With height constraint I mean a constraint like</p>
  
  <blockquote>
    <p>viewA.height = null * multiplier + constant</p>
  </blockquote>
  
  <p>i.e. <code>NSLayoutAttribute.NoAttribute</code> should be used!</p>
  
  <p>How can I do that with iOS Designer?</p>