code: protected String buildLivePreviousLink() {
          InternalStringBuilder builder = new InternalStringBuilder();
          AbstractRenderAppender appender = new StringBuilderRenderAppender(builder);
  
          buildAnchor(appender, _gridModel.getUrlBuilder().getQueryParamsForPreviousPage(), IDataGridMessageKeys.PAGER_MSG_PREVIOUS);
  
          return builder.toString();
      }
docs: Build an HTML anchor that contains URL state for navigating to the previous page of a data set.  The
  previous page is calculated relative to the current location in the {@link PagerModel}
  @return the HTML markup for anchor to the previous page