How to unsubscribe class handlers?

[yogesh]

I need to unsubscribe these events

 1. EventManager.RegisterClassHandler(typeof(RadTreeViewItem), Mouse.MouseDownEvent, new MouseButtonEventHandler(OnTreeViewItemMouseDown), false);
2. RegisterClassHandler(typeof(RadTreeView), RadDragAndDropManager.DragInfoEvent, new EventHandler<DragDropEventArgs>(OnTreeViewDragInfo), false);
3. RegisterClassHandler(typeof(RadTreeView), RadDragAndDropManager.DropQueryEvent, new EventHandler<DragDropQueryEventArgs>(OnTreeViewDropQuery), true);

[Martin Ivanov]

Hello Yogesh,

EventManager doesn't provide a method for unsubscribing for the globally registered event handlers. If you want to remove a handler you can use the RemoveHandler() method of UIElement. 

Also, keep in mind that RadDragAndDropManager is our old drag/drop API. We have a new manager called DragDropManager which has better implementation and it resolves some of the issue in the old drag/drop manager. With DragDropManager you can subscribe for the events using its Add[eventname]Handler() methods and the Remove[eventname]Handler() methods for removing handlers respectively.

Regards,
Martin
Telerik