code: public Widget getView(int dataIndex) {
          Widget view = null;
          for (Widget child: mContent.getChildren()) {
              ListItemHostWidget host = ((ListItemHostWidget) child);
              if (host.getDataIndex() == dataIndex) {
                  view = host.getGuest();
                  break;
              }
          }
          return view;
      }
docs: Get view from the list content by {@linkplain Adapter#getItem(int) data set index}.  This may
  not be the same as the {@linkplain GroupWidget#getChild(int) Widget child index}.
  @return Child Widget if the data at {@code dataIndex} is currently visible in the
  {@code ListWidget}, {@code null} if it is not.