append in list-box%

Adds a new item to the list of user-selectable items. The current selection is unchanged (unless the list control is an empty choice control, in which case the new item is selected).

• (send a-list-box append item data) -> void
     item : string
     data : value

  Adds a new item to the list box with an associated ``data'' object. The data object is not displayed in the list box; it is provided merely as a convenience for use with get-data, possibly allowing a programmer to avoid managing a separate item-to-data mapping in addition to the list box control.

  
  

• (send a-list-box append item) -> void
     item : string