Hello World Example Issue

Hello!

I am working through the Hello World example for iOS.. but am having an issue. In Xcode, when I drag the button over from the form to the header file, it seems I can only create an action, but not an outlet, like the tutorial shows.

Is there something I am doing wrong, or is this just a change in Xcode? Is there a more updated tutorial? I am pretty new to mobile development and the Xamarin framework, and am looking for a solid example that I can walk through to learn from.

Thanks! Paul