(form "20502" (size 40 7)
 (help "20502_TIP_0")
 (heading "ERASE BLOCK MODEL")
 (label (position 2 2) (text "Drawing to erase"))
 (field "drawing" (position  20  2) (display_length  4) (input allowed)
        (max_length 4)
        (translate upper) (format integer_4) (null disallowed))
 (default_buttons)
)