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

            _refreshControl = new MvxUIRefreshControl();
            DoneTasksTableView.AddSubview(_refreshControl);

            UIDevice.Notifications.ObserveOrientationDidChange(OrientationsHandler);
            netWork_button_constraint.Constant = TabBarController.TabBar.Frame.Size.Height;

            SetUpNavigationBar();

            var source = new TasksTableViewSource(DoneTasksTableView);

            DoneTasksTableView.Source = source;
            SetUpBinding(source);

            DoneTasksTableView.ReloadData();
        }
        void ReleaseDesignerOutlets()
        {
            if (DoneTasksTableView != null)
            {
                DoneTasksTableView.Dispose();
                DoneTasksTableView = null;
            }

            if (netWork_button_constraint != null)
            {
                netWork_button_constraint.Dispose();
                netWork_button_constraint = null;
            }

            if (netWork_label != null)
            {
                netWork_label.Dispose();
                netWork_label = null;
            }
        }