Currently in the listbox if you move an item up or down the list to reorder it, and the number of items in the list is greater than what's displayed on the screen, then the selected item doesn't stay in the display when it moves down the list.  The listbox should scroll as a selected item moves up or down off the display of the control so that it always stays in view. (Your Listbox in your ASP.NET Ajax suite already does this).  And this functionality should work whether you are using the keyboard, clicking the move up/down toolbar buttons or dragging and dropping the selected item.