import org.zkoss.zul.Hbox;
import org.zkoss.zul.Textbox;
doClick() {
Textbox l = new Textbox("Is this a ZK bug? The text here is cut off and the parent component does not resize as expected. Please fix this.");
l.setHflex("1");
Hbox hb = new Hbox();
hb.getChildren().clear();
hb.setHflex("1");
hb.appendChild(l);
authenticationBox.appendChild(hb);
}