if (e.isStructureOnly()) { return; }
  public synchronized void acceptDataSet(DataSetEvent e) {    m_visualizeDataSet = new Instances(e.getDataSet());    if (m_visualizeDataSet.classIndex() < 0) {      m_visualizeDataSet.setClassIndex(m_visualizeDataSet.numAttributes()-1);    }    if (!m_design) {      try {	setInstances(m_visualizeDataSet);      } catch (Exception ex) {	ex.printStackTrace();      }    }  }