get-data in list-box%

Returns the data value associated with a list box item, or #f if there is no associated data. See also append and set-data.

• (send a-list-box get-data n) -> value
     n : exact non-negative integer

  Returns the data for the item indexed by n. List box items are indexed from 0. If n is equal to or larger than the number of choices, an exn:application:mismatch exception is raised.