private boolean onOk(EnvironmentEvent event) {
if (clickHandler == null) return false;
final int index = selectedIndex();
final Object item = selected();
if (index < 0 || item == null) return false;
return clickHandler.onListClick(this, index, item);
}
protected boolean onEnter(KeyboardEvent event) {
if (isEmpty() || clickHandler == null) return false;
if (selected() == null || selectedIndex() < 0) return false;
return clickHandler.onListClick(this, selectedIndex(), selected());
}