private ScreenView unknownCommandMessage() {
    cancelTimer();
    return topScreenPresenter.goToMessageMode(getScreen(), getTerminal(), MESSAGE_ROW,
      "Unknown command - try 'h' for help");
  }
The screen that provides a dynamic real-time view for the HBase metrics. This shows the metric
{@link Summary} and the metric {@link Record}s. The summary and the metrics are updated
periodically (3 seconds by default).
hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/screen/top/TopScreenView.java