sf_cua_validate     Function displays the valid_question block
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 *  function int sf_cua_validate prototype
      parameters const char window_title,;
                 const char valid_question,;
                 value int window_color,;
                 value ulong button_time

    This function displays the valid_question block within a window and
    prompts the user for Ok or Cancel.  The valid_question format allows
    the ending of each line with a ';'.   Button_time is the loop time
    during which the button will remain pressed on the screen.

    Example:

    *\ Place  "Do you" on line 1
    *\ and    "want to quit" on line 2

    sf_cua_validate( "Query", "Do you; want to quit;", &CUA_WHITE, 15000 )