gistfile1.txt

	public static class NSArrayControllerPatch
	{
		static readonly IntPtr selSetFilterPredicate_Handle = ObjCRuntime.Selector.GetHandle ("setFilterPredicate:");

		[System.Runtime.InteropServices.DllImport ("/usr/lib/libobjc.dylib", EntryPoint="objc_msgSend")]
		public extern static void void_objc_msgSend_IntPtr (IntPtr receiver, IntPtr selector, IntPtr arg1);

		public static void SetFilterPredicate (this NSArrayController c, NSPredicate p)
		{
			void_objc_msgSend_IntPtr (c.Handle, selSetFilterPredicate_Handle, p == null ? IntPtr.Zero : p.Handle);
		}
	}


insetad of 	PersonsArrayController.SetFilterPredicate (null);
				PersonsArrayController.FilterPredicate = null;