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   A Combination Box, also called Combo box, is a control made up of
   two parts: a line-entry field and a List-box. The line-entry field
   contains the current value of the symbol (variable or field), while the
   List-box contains all of its possible values.

   An icon, placed on the right side of the line-entry field, allows to open
   the associated List-box. During the modification or insertion phase, the
   selection of one of the values displayed in the List-box will copy the
   value of the first column into the line-entry field, thus becoming the
   current value of the symbol.

   To define a Combo box, the symbol (variable or field) to be evaluated and
   the data origin (file or array) must be specified. The definition of these
   parameters comes about in the properties environment of the Combo box. To
   define what columns are to be displayed in the list-box, it must first be
   activated. This is done by highlighting the Combo box and pressing
   Enter. In the open list-box, press Alt-F1 or Alt-1 to add the
   desired columns.

Note - data displayed by the List-box comes from the file or array
   specified as List-box data origin available on the Combo box's
   properties.
    The line-entry field of the Combo box is evaluated with the value
   indicated in the first column of the List-box.

   If the Data check property of the Combo box is set to Yes - check,
   the system will check the data entered in the line-entry field against the
   list of possibilities contained in the list box column. If setting the
   same property to No - do not check, the system accepts any data
   entered, and the list-box can be used to pick from predefined values.

   Selecting the Combo box and pressing the Space Bar, the Definition
   frame will be activated.

   The size of the open list-box can be modified by pressing F4 on the
   closed Combo box.