.
   */
  private Column&lt;ContactInfo, String&gt; lastNameColumn;

  /**
   * Column displays age.
   */
  private Column&lt;ContactInfo, Number&gt; ageColumn;

  /**
   * Column displays category.
   */
  private Column&lt;ContactInfo, String&gt; categoryColumn;

  /**
   * Column displays address.
   */
  private Column&lt;ContactInfo, String&gt; addressColumn;

  /**
   * Initialize this example.
   */
  @Override
  public Widget onInitialize() {
    resources = GWT.create(Resources.class);
    resourc