(form "00906" (size 69  9)
  (help "00906_TIP_0")
  (heading "SELECT MODEL")
  (label (position  2  3) (text "Model name"))
  (label (position  2  5) (text "Load with constraints"))
  (label (position  2  6) (text "Constrained model name"))
      
  (field "modname" (position 15  3) (display_length 40) (input allowed)
    (translate lower) (null disallowed) (max_length 40)
    (file (extension "*.mdl,*.mod,*.res,*.dm,*.dms,*.fbm,*.bpr,*.bpr2,*.bmf"))
  )
  (field "use_const" (position 24 5) (display_length 3) (input allowed)
    (translate upper) (null disallowed) 
    (value_in "Y" "N")
    (default "N")
    (help "00906_TIP_1")
  )
  (field "const_mod_name" (position 24 6) (display_length 40) (input allowed)
     (translate lower) (max_length 40) (null disallowed)
     (default "")
     (help (field "use_const"))
     (dependency (value "use_const") == "Y")
  )
  (default_buttons)
)