}
public void createContentContainer()
{
TreePanel treePanel = new TreePanel();
ContentPanel contentPanel = new ContentPanel();
EventDispatchService service = EventDispatchService.getInstance();
service.subscribe(OpenFileEvent.class, treePanel);
service.subscribe(OpenHistoryFileEvent.class, treePanel);
service.subscribe(OpenHistoryFileEvent.class, contentPanel);
service.subscribe(OpenFileEvent.class, contentPanel);