code: protected void checkCreate ()
      {
          if (_creator != null && isShowing()) {
              // ideally, we would replace ourselves in our parent, but that
              // doesn't seem to work in JTabbedPane
              setLayout(new BorderLayout());
              add(_creator.createContent(), BorderLayout.CENTER);
              _creator = null;
          }
      }
docs: Check to see if we should now create the content.