code: public static void addMessageMonitor(DialogPage dialogPage,
  			Messagable monitor) {
  		dialogPage.addPropertyChangeListener(Messagable.MESSAGE_PROPERTY,
  				new MessageHandler(monitor));
  	}
docs: Add a message monitor. Each monitor will have its
  {@link Messagable#setMessage(Message)} method called whenever the MESSAGE
  property on the dialog page changes.
  
  @param dialogPage
  to monitor
  @param monitor
  to add