This control provides a simple and intuitive way for a user to make multiple item selections. Available items are displayed in one list, selected items displayed in another. It is possible to filter elements using Filter text field. It is also possible to display ToolTip with additional description for each item. This control works without postback between the movement of the Lists and has AutoSorting and PreSelect properties. Control supports AJAX behavior: partially items loading and fast items uploading for large items collections. ASP.NET AJAX supports.