code: protected void doHandleAjaxRefresh() {
  		final Action action = getRefreshAction();
  		if (action == null) {
  			return;
  		}
  
  		final ActionEvent event = new ActionEvent(this, AJAX_REFRESH_ACTION_COMMAND, getAjaxFilter());
  		Runnable later = new Runnable() {
  			@Override
  			public void run() {
  				action.execute(event);
  			}
  		};
  
  		invokeLater(later);
  	}
docs: Handle the AJAX refresh request.