/** @return the control. */
  public Widget asWidget() {
    Column<?> containerTotalCountItem =
        new NumberColumn("ContainerTotalCount", "Total Count").setVisible(false);
    Column<?> totalCountItem = new NumberColumn("TotalCount", "Total Count").setBaseline(true);
    Column<?> successCountItem =
        new NumberColumn("SuccessCount", "Success Count").setComparisonColumn(totalCountItem);
    Column<?> faultCountItem =
        new NumberColumn("FaultCount", "Fault Count").setComparisonColumn(totalCountItem);
    if (_displaysChildMetrics) {
      totalCountItem.setComparisonColumn(containerTotalCountItem);
    }

    // XXX: these should really be "LongColumn"
    Column<?> containerTotalProcessingTime =
        new NumberColumn("ContainerTotalProcessingTime", "Total Processing Time")
            .setVisible(false)
            .setBaseline(true);
    Column<?> totalProcessingTimeItem =
        new NumberColumn("TotalProcessingTime", "Total Processing Time");
    if (_displaysChildMetrics) {
      totalProcessingTimeItem.setComparisonColumn(containerTotalProcessingTime);
    }

    // XXX: using TextColumn for long and double fields
    Column<?> averageProcessingTimeItem =
        new TextColumn("AverageProcessingTime", "Average Processing Time");
    Column<?> minProcessingTimeItem = new TextColumn("MinProcessingTime", "Min. Processing Time");
    Column<?> maxProcessingTimeItem = new TextColumn("MaxProcessingTime", "Max. Processing Time");

    _messageCounts = new PlainColumnView("Message Counts");
    _messageCounts.setColumns(
        containerTotalCountItem, totalCountItem, successCountItem, faultCountItem);

    _processingTimes = new PlainColumnView("Processing Times");
    _processingTimes.setColumns(
        containerTotalProcessingTime,
        totalProcessingTimeItem,
        averageProcessingTimeItem,
        minProcessingTimeItem,
        maxProcessingTimeItem);

    VerticalPanel panel = new VerticalPanel();
    panel.setStyleName("fill-layout-width");

    panel.add(_messageCounts.asWidget());
    panel.add(_processingTimes.asWidget());
    return panel;
  }
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  public void getMetricDescriptions(
      AddressCallback address, Column[] columns, final AsyncCallback<HTML> callback) {

    final List<String> attributeNames = new LinkedList<String>();
    for (Column c : columns) attributeNames.add(c.getDeytpedName());

    final ModelNode operation = address.getAddress();
    operation.get(OP).set(READ_RESOURCE_DESCRIPTION_OPERATION);
    operation.get(LOCALE).set(getLocale());

    dispatcher.execute(
        new DMRAction(operation),
        new AsyncCallback<DMRResponse>() {
          @Override
          public void onSuccess(DMRResponse result) {
            ModelNode response = result.get();

            if (response.isFailure()) {
              Log.debug(response.toString());
              onFailure(new Exception(response.getFailureDescription()));
            } else {
              final SafeHtmlBuilder html = new SafeHtmlBuilder();
              html.appendHtmlConstant("<table class='help-attribute-descriptions'>");

              ModelNode payload = response.get(RESULT);

              ModelNode descriptionModel = null;
              if (ModelType.LIST.equals(payload.getType()))
                descriptionModel = payload.asList().get(0);
              else descriptionModel = payload;

              matchSubElements(descriptionModel, attributeNames, html);

              html.appendHtmlConstant("</table>");

              callback.onSuccess(new HTML(html.toSafeHtml()));
            }
          }

          @Override
          public void onFailure(Throwable caught) {
            callback.onFailure(caught);
          }
        });
  }