Introducing the Popover iOS 8 storyboard

I am making an iOS 8 app and I like to use a storyboard whenever possible. My problem is very simple, I want to make a simple view that appears when the user clicks a button entirely from the storyboard! When the user clicks "ADD", a popover is displayed.

So, I did this:

It works on iPad:

but on iPhone (any) the popup is shown in full screen mode.

But I thought the new popover system works on iOS 8 (my deployment target is iOS 8)

Does anyone know why? Thank you in advance. And sorry for my english.