message+check-box/custom in Dialogs

• (message+check-box/custom title message check-label button1-label button2-label button3-label parent style close-result) -> 1, 2, 3, or close-result
   title : string (up to 200 characters)
     message : string
     check-label : string (up to 200 characters)
     button1-label : string (up to 200 characters), bitmap% object, or #f
   button2-label : string (up to 200 characters), bitmap% object, or #f
   button3-label : string (up to 200 characters), bitmap% object, or #f
   parent = #f : frame% or dialog% object or #f
   style = '(no-default) : list of symbols in '(default=1 default=2 default=3 no-default disallow-close number-order caution stop checked)
   close-result = #f : value

  Like message-box/custom, except that

  • the dialog contains a check box whose label is check-label;

  • the result is two values: the message-box result, and a boolean indicating whether the box was checked; and

  • style can contain 'checked to indicate that the check box should be initially checked.