{
final Widget child = obj.asWidget();
if (child instanceof HasEnsureVisibleHandlers)
{
((HasEnsureVisibleHandlers)child).addEnsureVisibleHandler(
new EnsureVisibleHandler()
{
public void onEnsureVisible(EnsureVisibleEvent event)
{
parent_.fireEvent(new EnsureVisibleEvent(event.getActivate()));
}