}
public void onClick$btn_javaListbox(Event event) throws InterruptedException {
logger.info(event.getName());
final Listbox listbox = new Listbox();
listbox.setWidth("300px");
listbox.setHeight("300px");
listbox.setVisible(true);
final Listhead lHead = new Listhead();
lHead.setParent(listbox);
final Listheader lHeader1 = new Listheader();
lHeader1.setWidth("30%");
lHeader1.setLabel("Column 1");
lHeader1.setParent(lHead);
lHeader1.setVisible(true);
final Listheader lHeader2 = new Listheader();
lHeader2.setWidth("30%");
lHeader2.setLabel("Column 2");
lHeader2.setParent(lHead);
final Listheader lHeader3 = new Listheader();
lHeader3.setWidth("40%");
lHeader3.setLabel("Column 3");
lHeader3.setParent(lHead);
// set the parent where should hold the listbox.
// ZK do the rendering
listbox.setParent(this.panelChildJavaListbox);
}