interface builder - ios Autolayout in storyboard not showing controls in iPhone simulator -

interface builder - ios Autolayout in storyboard not showing controls in iPhone simulator -

i´m doing simple tutorial of how work in storyboards. created project iphone, added uibutton within view of viewcontroller in storyboard. made right constraints center button in portraint , landscape modes. if run in iphone, button in simulator doesn´t show if run in ipad simulator it´s there, , constraints working. why?

thanks.

ios interface-builder autolayout storyboarding