How do I (easily) delete a constraint in Interface Builder in Xcode 6

Question

Assume you\'ve selected an object and you have the Size Selector in the Utilities panel open. You can see the list of constraints applied to the object. In the list of constrain

Answer 1

In Xcode6 (Beta5) when I click on a particular constraint in the Size inspector, it acquires a thin blue border. The constraint can then be deleted using the backspace.