[MonoTouch] Wrapper type 'Monotouch.UIKIT.UIActionSheetDelegate' is missing its native Objective C class 'UIActionSheetDelegate'. Please check if its be linked

[Andreas Ploetzeneder]

Wrapper type 'Monotouch.UIKIT.UIActionSheetDelegate' is missing its
native Objective C class 'UIActionSheetDelegate'. Please check if its
be linked

whats wrong here?

------------------



using System;
using System.Collections.Generic;
using System.Linq;
using MonoTouch.Foundation;
using MonoTouch.UIKit;

namespace Sepp
{
	public class HaupttabelleDelegate : UITableViewDelegate
{   	
    private Haupttabelle _controller;

    public HaupttabelleDelegate(Haupttabelle controller)
    {
    	_controller = controller;	
			z=	new UIActionSheetDelegate();
    }

	Detailtabelle x;
	UIActionSheet y;
	UIActionSheetDelegate z;
    public override void RowSelected (UITableView tableView,
NSIndexPath indexPath)
    {
		y = new UIActionSheet("Frage",z,"Abbrechen",null,"Bestätigen mit
Kommentar","Bestätigen");
	y.CancelButtonIndex=2;
			y.Clicked+= delegate(object sender, UIButtonEventArgs e) {
                                switch (e.ButtonIndex) {
                                        case 0:

System.Diagnostics.Debug.WriteLine("Bestaetigen mit Kommentar");
                                                break;
                                        case 1:

System.Diagnostics.Debug.WriteLine("Bestaetigen ");
                                                break;
					 				case 2:

System.Diagnostics.Debug.WriteLine("Abbrechen ");
                                                break;
				}};
		y.ShowInView(_controller.View);
		System.Diagnostics.Debug.WriteLine("Zeile:"+indexPath.Row.ToString());
    }
}

}