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   List-box controls are used whenever it is necessary to display
   information in tabular format.

   For instance, using a List-box to display the contents of a file, each row
   of the list-box corresponds to a file's record, while the columns are the
   file's fields.

   A List-box allows to display the N records of a child file associated to
   the current record of the main file (in a 1:N relation). In fact, an
   Invoice-like data entry is built with a Form and a List-box for the
   invoice details.

   List-boxes can also be used to display the contents of an array.

   Once the List-box is created, the data that is to be displayed must be
   defined. In order to select what to display inside the List-box, some
   parameters must be defined in the Properties, pressing the Ctrl-Enter
   on its outline.

     . The type of data to display (coming from a file or an
       array).

     . The file or array that contains the information to display.

     . The columns to display, in other words which fields of the
       file or columns of the array (if it is a two dimensional array) are to
       be brought within a List-box.