ParentViewController not working

I have a homeViewController which PerformSegue() calls a popover view controller. Yet from the Popover's view controller when I call Console.WriteLine("a) " + base.ParentViewController ); Console.WriteLine("b) " + this.ParentViewController ); Console.WriteLine("c) " + ParentViewController ); They all return blank nothing? What am I missing ? Why from the Popover can I not call the ParentViewController

Thanks in advance