Elements of Canvas with Constant Physical Size doesn't show up in iOS Simulator

I'm making an UI that should scale across all iDevises - and since I don't own all of them, I really want to use Xcode's iOS Simulator. However when I create a Canvas, and choose Canvas Scaler -> Ui Scale Mode: Constant Physical Size, all of the elements of this canvas (eg. buttons) doesn't show up, when I build and try it out in Xcode's iOS Simulator.

Here is how to reproduce it:

 Make a new Unity project
 Gameobject -> UI -> Button
 (This also creates a Canvas and an EventSystem)
 Choose: Canvas -> Canvas Scaler -> Ui Scale Mode: Constant Physical Size
 Save the scene
 Choose: File -> Build Settings… ->
     Platform: iOS
     Switch Platform
     Player Settings… ->
         Other Settings -> SDK Version: Simulator SDK
     Build

I'm on Unity 4.6.2f1 and Xcode 6.1.1.

I'm totally lost - can anyone please help? :-)