// 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) };
    
    if (!isSubstanceLAF())
      print("Can't add title right click!");
    else
      componentPopupMenu(getInternalFrameTitlePaneComponent(f), menuMaker);
  }
}