code: public void setExtraInfo(String text) {
  
          if (text == null) {
              if (m_shortExtraInfoLabel.getParent() != null) {
                  m_shortExtraInfoLabel.removeFromParent();
              }
          } else {
              if (m_shortExtraInfoLabel.getParent() == null) {
                  m_titleBox.add(m_shortExtraInfoLabel);
              }
              m_shortExtraInfoLabel.setText(text);
          }
          updateTruncation();
      }
docs: Sets the extra info text, and hides or displays the extra info label depending on whether
  the text is null or not null.<p>
  
  @param text the text to put into the subtitle suffix