code: public static void start(Panel rootContainer) {
  		manager.setRootContainer(rootContainer);
  		History.addValueChangeHandler(manager);
  		History.fireCurrentHistoryState();
  	}
docs: Starts the framework, rendering the {@link View#defaultView()} to the page.
  
  @param rootContainer The body widget of the page. Usually <code>RootLayoutPanel.get()</code>.