SplitPanel.setLeftComponent(modelTree);
treeScrollPane.setViewportView(modelTree);  SplitPanel.setLeftComponent(treeScrollPane);
    private void initComponents() {//GEN-BEGIN:initComponents        treeScrollPane = new javax.swing.JScrollPane();        SplitPanel = new javax.swing.JSplitPane();        modelTree = new javax.swing.JTree();        DescriptionArea = new javax.swing.JTextArea();        setLayout(new java.awt.BorderLayout());        modelTree.addPropertyChangeListener(new java.beans.PropertyChangeListener() {            public void propertyChange(java.beans.PropertyChangeEvent evt) {                modelTreePropertyChange(evt);            }        });        SplitPanel.setLeftComponent(modelTree);        DescriptionArea.setEditable(false);        SplitPanel.setRightComponent(DescriptionArea);        treeScrollPane.setViewportView(SplitPanel);        add(treeScrollPane, java.awt.BorderLayout.CENTER);    }//GEN-END:initComponents