sclass PopupMenuMaker {
  settable bool allowScrolling = true;
  settable MouseEvent event;
  settable IVF1<JPopupMenu> fillMenu;

  run {
    new JPopupMenu menu;
    int emptyCount = menu.getComponentCount();
    fillMenu?.get(menu);
    if (menu.getComponentCount() == emptyCount)
      ret;
  
    if (allowScrolling) {
      menu = new JPopupMenu;
      JMenuScroller scroller = JMenuScroller.setScrollerFor(menu);
      scroller.fillMenu = toVF1(fillMenu);
    }
  
    menu.show(event.getComponent(), event.getX(), event.getY());
  }
}