How to refresh nested ListView after adding record by PopupWindowShowAction?

How to refresh nested ListView after adding record by PopupWindowShowAction?

C#
public partial class ActivityItemViewController : ViewController  
    {  
        public ActivityItemViewController()  
        {  
            InitializeComponent();  
            RegisterActions(components);  
            TargetObjectType = typeof(ActivityItem);  
            TargetViewType = ViewType.ListView;  
        }  

        private ActivityItem _activityItem;  

        private void addActivityItemAction_CustomizePopupWindowParams(object sender, CustomizePopupWindowParamsEventArgs e)  
        {  
            IObjectSpace objectSpace = Application.CreateObjectSpace();  

            _activityItem = objectSpace.CreateObject<ActivityItem>();  
            var detView = Application.CreateDetailView(objectSpace, "ActivityItem_DetailView", true, _activityItem);  
            e.View = detView;  
        }  

        private void addActivityItemAction_Execute(object sender, PopupWindowShowActionExecuteEventArgs e)  
        {  
            //!!! NOT REFRESHED  
            View.ObjectSpace.Refresh();  
            View.Refresh();  
        }  

    }