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   The most common use of this type of control concerns the evaluation of a
   symbol (variable or field), selecting from a list of predefined values
   that are taken directly from a file or an array.

    . Useful information about the input validation that can be
       performed on the data entered into the Get control, please consult the
       Field controls chapter.

Example:

   Suppose that we want to insert the State of a client (StaCli field in
   the Cli file), a Combination Box can be used to choose a value among
   those memorised in the StaCli field of file State. To make a Combo
   box with this functionality, it is necessary to set the parameters found
   in the environment activated by the Options button present in the
   definition frame of the Combo box. These parameters are:

     
     Origin type..............: Field
     
     Combo box data origin....: StaCli
     
     List-box data type.......: File
     
     List-box data origin.....: State

   At this point, it is necessary to add a column to the list-box, with which
   to display all values that can be found in the StaCli field of file
   State. Highlight the Combo box and press Enter. In the empty
   list-box, press Alt-1, and select file State. From the list of
   fields, tag StaCli with Ctrl-Space and terminate the operation
   with Enter