public void drillDown() {
    Record selectedRecord = getSelectedRecord();
    if (selectedRecord == null) {
      return;
    }
    if (topScreenModel.drillDown(selectedRecord)) {
      reset();
      refresh(true);
    }
  }
The presentation logic for the top screen.
hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/screen/top/TopScreenPresenter.java