// menuMaker = voidfunc(JPopupMenu)
static void internalFrameTitlePopupMenu(final JInternalFrame f, fO... params) {
  awt {
    O menuMaker;
    if (l(params) == 1)
      menuMaker = params[0];
    else
      menuMaker = voidfunc(JPopupMenu menu) { addMenuItems(menu, params) };
    
  Component titleComponent = getInternalFrameTitlePaneComponent(f);
  if (titleComponent == null)
    print("Can't add internal frame title popup menu!");
  else
    componentPopupMenu(titleComponent, menuMaker);
}