code: public MessageDialogBuilder setExtraWindowHints(Collection<Window.Hint> extraWindowHints) {
          this.extraWindowHints.clear();
          this.extraWindowHints.addAll(extraWindowHints);
          return this;
      }
docs: Assigns a set of extra window hints that you want the built dialog to have
  @param extraWindowHints Window hints to assign to the window in addition to the ones the builder will put
  @return Itself