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   A Spin button control allows the user to choose a value from a finite
   set of related but mutually exclusive values that have a natural sequence.
   The value displayed will be used to evaluate the associated symbol (field
   or variable). Graphically, the spin button is represented by a Get and two
   up and down arrow icons.

   Using these two icons during modification or insertion you will be able to
   modify the contents of the field, going respectively to next acceptable
   value and to the previous one.

   To associate a Spin button to a field it is necessary to indicate which
   field it will refer to and which are the accepted values. These choices
   are made in the definition frame of the Spin button.

   After having positioned the Spin button control (Alt-F1 keys) and
   having highlighted it (positioning the cursor on the control), the Space
   Bar will activate its Definition Frame.