code: def multchoicebox(msg="Pick as many items as you like."
      , title=" "
      , choices=()
      , **kwargs
      ):
      
      if len(choices) == 0: choices = ["Program logic error - no choices were specified."]
  
      global __choiceboxMultipleSelect
      __choiceboxMultipleSelect = 1
      return __choicebox(msg, title, choices)
docs: Present the user with a list of choices.
      allow him to select multiple items and return them in a list.
      if the user doesn't choose anything from the list, return the empty list.
      return None if he cancelled selection.
  
      @arg msg: the msg to be displayed.
      @arg title: the window title
      @arg choices: a list or tuple of the choices to be displayed