Autoplay in XIB with UIToolBar hangs Xcode 6.0.1

I changed the Xib (which had a UIToolBar as one of its components) to auto-layout and started adding constraints. He hung up Xcode. The cocoa interface designer touched almost 100% of the CPU. I have recreated xib without toolbar and added constraints. It worked fine. Then I added a UIToolBar and tried to hang Xcode with it. I have not added any restrictions for the UIToolBar.

So how do I change an Xib that doesn't use auto-layout to use auto-layout and add constraints?