weka.gui.beans.BeanConnection.reset(); weka.gui.beans.BeanInstance.reset(null);
                public void windowClosing(WindowEvent w) {                  m_KnowledgeFlowFrame.dispose();                  m_KnowledgeFlowFrame = null;                  weka.gui.beans.BeanConnection.reset();                  weka.gui.beans.BeanInstance.reset(null);                  m_KnowledgeFlowBut.setEnabled(true);                  checkExit();                }