OnClientTransferring
The OnClientTransferring client-side event occurs when the selected item is about to be transferred to the destination RadListBox. This event can be cancelled.
The event handler receives two parameters:
- 
The instance of the listbox firing the event
 - 
An event arguments parameter containing the following methods:
 
- 
get_item() - returns the item that is about to be transferred.
 - 
get_items() - returns an array of items that are about to be transferred
 - 
get_sourceListBox() - returns the instance of the source RadListBox which the item currently belongs to
 - 
get_destinationListBox() - returns the instance of the destination RadListBox where the item is transferring to.
 - 
set_cancel() - lets you cancel the event and prevent items from being selected.
 - 
get_domEvent() - returns the DOM event object
 
The example below shows how to ask the user before transferring the item:
function onClientTransferringHandler(sender, e) {
	if (!confirm("Are you sure?")) {
		e.set_cancel(true);
	}
}