DELEGATE(button, WhenAction,
    _this.Title("Title changed!");
  );

  DELEGATE1(button, WhenAction,
    String, s, "Parameter test",
    {
        PromptOK(s);
        _this.Title(s);
    });
  ...
  Vector<String> list;
  ...
  foreach(String v,list, PromptOK(v));

  String s;
  foreach(String v, list,
    s+=v;
    PromptOK(s);
  );