I have duplicated this on both Xcode 6 - beta 2 AND Xcode 5 on a different machine. Surely this can't be a bug as it is such a common task it would have been caught by now.
I drag a tab bar to a view controller. All good.
I drag an additional tab bar item to the tab bar. Not good. The tab bar becomes obscured by a grey box. The grey box stays visible when the app is built and run.
Has this happened to any of you? Any ideas?
Short screen recording to demonstrate: https://www.youtube.com/watch?v=r-iS-tmUmBM&feature=youtu.be!
Pictures: