public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Perform any additional setup after loading the view
            UIDatePicker datePicker = new UIDatePicker();

            datePicker.Mode            = UIDatePickerMode.Date;
            datePicker.BackgroundColor = UIColor.White;

            datePicker.MinimumDate = (NSDate)DateTime.Today.AddDays(-7);
            datePicker.MaximumDate = (NSDate)DateTime.Today.AddDays(7);

            UIToolbar toolbar = new UIToolbar();

            toolbar.BarStyle    = UIBarStyle.Default;
            toolbar.Translucent = true;
            toolbar.SizeToFit();

            UIBarButtonItem doneButton = new UIBarButtonItem("Done", UIBarButtonItemStyle.Done,
                                                             (s, e) =>
            {
                DateTime dateTime = DateTime.SpecifyKind((DateTime)datePicker.Date,
                                                         DateTimeKind.Unspecified);


                datePicker.ResignFirstResponder();
            });

            toolbar.SetItems(new UIBarButtonItem[] { doneButton }, true);

            // this.textField.InputAcessoryView = toolbar;
            datePicker.AddSubview(toolbar);
            this.Add(toolbar);

            //this.textField.InputView = picker;
            this.Add(datePicker);
        }