Immediate ItemDragMode in RadNavigationView

Hello, Armand, 

RadNavigationView actually represents a RadPageView with already applied ViewMode to NavigationView. The whole API that is available for the PageViewMode.NavigationView is also valid for RadNavigationView. 

The following code snippet demonstrates how to start the service for RadNavigationView:

        public RadForm1()
        {
            InitializeComponent();

            this.radNavigationView1.ViewElement.ItemDragMode = PageViewItemDragMode.Immediate;
            this.radNavigationView1.ViewElement.ItemDragService.PreviewDragStart += ItemDragService_PreviewDragStart;
        }

        private void ItemDragService_PreviewDragStart(object sender, PreviewDragStartEventArgs e)
        {
            e.CanStart = true;
        }

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik