protocol.cs

// Maybe inside a helper class

	[DllImport (MonoTouch.Constants.ObjectiveCLibrary, EntryPoint = "class_addProtocol")]
	static extern bool AddProtocol (IntPtr cls, IntPtr protocol);

	[DllImport (MonoTouch.Constants.ObjectiveCLibrary, EntryPoint = "objc_getProtocol")]
	static extern IntPtr GetProtocol (string name);
	
// This ones must be called before the actual usage of the class, maybe in finished launching but up to you

	var objRestorationProtocol = GetProtocol ("UIObjectRestoration");
	AddProtocol (Class.GetHandle (DetailViewController), objRestorationProtocol);

	var ctrlRestorationProtocol = GetProtocol ("UIViewControllerRestoration");
	AddProtocol (Class.GetHandle (DetailViewController), ctrlRestorationProtocol);