Xamarin IOS storyboard scrollview doesn't scoll

I'm trying to create a signup form in a storyboard in the Xamarin Studio editor, but I can't get i to scroll.

I have set AutoLayout to false.

My Document outline can be seen at the picture:

And in my CreateUserViewController I have the following:

public override void ViewDidLoad ()
{
   ScrollSignup.ContentSize = new CoreGraphics.CGSize (1000, 1000);
   base.ViewDidLoad ();
}

The view is set to 700 in height