_rod = evalRod();
final String loadercls = (String) Library.getProperty("org.zkoss.zul.listbox.DataLoader.class");
try {
_dataLoader = _rod && loadercls != null ? (DataLoader) Classes
.forNameByThread(loadercls).newInstance()
: new ListboxDataLoader();
} catch (Exception e) {
throw UiException.Aide.wrap(e);
}
_dataLoader.init(this, 0, 40);
}