This demo illustrates how all items or only selected ones can be moved from one ASPxListBox to another on the client side in
response to button clicks.
Selected items are obtained by using an editor's client GetSelectedItems method. Moving items is performed by removing them
from one editor's Items collection (via the client RemoveItem method) and adding them to another editor
(via the client AddItem method).
Note that the client BeginUpdate and EndUpdate methods are used by both editors to encapsulate item moving code.
This is required to avoid repetitive operations (such as editor size correction) until all items are moved.