private Component getContent(boolean first) {
          if (myContentProvider != null) {
            Content[] contents = myContentProvider.getContents();
            if (contents != null && contents.length > 0) {
              Component preferred = contents[first ? 0 : contents.length - 1].getPreferredFocusableComponent();
              if (preferred != null && preferred.isShowing() && accept(preferred)) {
                return preferred;
              }
            }
          }
          return null;
        }
private Component getContent(boolean first)