The RemoveItem method removes an item. The RemoveItem method does not remove the item, if it contains child items. Use the RemoveAllItems method to remove all items in the control. Use the BeginUpdate and EndUpdate methods to maintain performance while removing the items. The RemoveItem method can't remove an item that's locked. Instead you can use the LockedItemCount property to add or remove locked items. Use the IsItemLocked property to check whether an item is locked. The RemoveSelection method removes the selected items (including the descendents).