RadPageViewDragDropService
RadPageView allows you to reorder the page items/tabs if the RadPageView.ViewElement.ItemDragMode property is set to Preview or Immediate.
Figure 1: PageViewItemDragMode.Immediate
Figure 2: PageViewItemDragMode.Preview
This functionality is achieved by the RadPageViewDragDropService which can be accessed by the RadPageView.ViewElement.ItemDragService property. Similar to RadDragDropService, RadPageViewDragDropService exposes public events which allows to handle the drag and drop operation and customize it according to your requirements, e.g. control which page tabs to be dragged or on what target to drop them.