(form "20021" (size 40  6)
  (heading "CONFIRM DRAW BLOCK MODEL")
  (label (position  2  2) (text "Total Amount of blocks"))
  (field "amount" (position  12  2) (display_length 20) (input disallowed)
    (format range) (null disallowed) (max_length 32))
  (label (position  2  2) (text "This may take a very long time to process and draw, do you wish to continue?"))
  (label (position  3  3) (text ""))
  (default_buttons)
)