@UiHandler("list")
void onListSelectionChanged(SelectionChangedEvent e) {
switch (e.getSelection()) {
case 0:
if (ChildBrowser.getEventHandler() == null) {
ChildBrowser.setEventHandler(new EventHandler() {
@Override
public void onOpenExternal() {
Window.alert("Child Browser onOpenExternal event fired.");
}
@Override