Mostrar nós de uma JTree em outro painel

private void createAndShowGUI() {

		this.setBounds(100, 200, 530, 370);
		this.setPreferredSize(new Dimension(530, 370));
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setResizable(false);
		this.setLayout(null);
		
		this.formatPanelButtons();
    	this.formatPanelTree();
    	
    	if (this.gauges != null){
    		this.insertDataIntoTable();
    	}
	}

	private void formatPanelTree(){
//    	this.listFiles = new JList();
//    	filesVector = new Vector<File>();
		
		this.panelLeft = new JPanel(new GridLayout(1,0));
    	this.panelLeft.setBackground(this.getBackground());
    	this.panelLeft.setBounds(20, 20, 340, 300);
    	this.panelLeft.setVisible(true);

    	//building tree
    	this.tree = this.buildTreeDirectories();
    	this.tree.setRootVisible(false); 
    	this.tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);

    	renderer = (DefaultTreeCellRenderer)this.tree.getCellRenderer();
    	renderer.setLeafIcon(renderer.getDefaultOpenIcon());
    	
    	this.tree.setVisible(true);
    	
    	tree.addTreeSelectionListener(this);
    	
    	this.formatPanelTreeOfDirectories();
    	
    	this.formatPanelTreeFiles();
    	
    	JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
    	splitPane.setTopComponent(this.panelDir);
		splitPane.setBottomComponent(this.panelFiles);
    	
		Dimension minimumSize = new Dimension(100,50);
		this.panelDir.setMinimumSize(minimumSize);
		this.panelFiles.setMinimumSize(minimumSize);
		splitPane.setDividerLocation(150);

		splitPane.setPreferredSize(new Dimension(500,300));
		splitPane.setVisible(true);

//		this.panelFiles.add(listFiles);
		
		this.panelLeft.add(splitPane);
    	
    	this.add(this.panelLeft);
    	
	}

	private void formatPanelTreeFiles() {
		this.panelFiles = new JScrollPane();
    	this.panelFiles.setBorder(new EtchedBorder());
//    	this.panelFiles.setBackground(Color.WHITE);
    	

//    	JList listFiles = new JList();
    	
    	if(this.onlyFiles!=null){
    		for(int i=0;i<this.onlyFiles.length;i++){
    			System.out.println(this.onlyFiles[i].getName());
    		}
        	this.panelFiles.add(this.renderer.getComponent(0));
    		
//    		listFiles.setListData(onlyFiles);
    	}

//    	this.panelFiles.add(listFiles);
    
    	this.panelFiles.setVisible(true);
    	
	}

	private void formatPanelTreeOfDirectories() {
		this.panelDir = new JScrollPane(this.tree);
    	this.panelDir.setBorder(new EtchedBorder());
    	this.panelDir.setVisible(true);
	}

	public JTree buildTreeDirectories(){
		DefaultMutableTreeNode root = new DefaultMutableTreeNode("root", true);

		this.getListFiles(root, new File("C:/Arquivos de programas/"));
		
		JTree tree = new JTree(root);
		
		return tree;
	}
	
	private void getListFiles(DefaultMutableTreeNode node, File f) {
		
		if(!f.isDirectory()){
//			DefaultMutableTreeNode childFile = new DefaultMutableTreeNode(f);
//			node.add(childFile);
		}
		else{
			DefaultMutableTreeNode child = new DefaultMutableTreeNode(f);
			node.add(child);
			File fileList[] = f.listFiles();
			for(int i = 0; i  < fileList.length; i++)
				getListFiles(child, fileList[i]);
		}
	}

	public void valueChanged(TreeSelectionEvent e) {
		DefaultMutableTreeNode node = (DefaultMutableTreeNode)
										tree.getLastSelectedPathComponent();

		//fazer com que isso vire global pra que eu pegue de la do metodo de cima os
//		objetos que neste metodo foram construido e os adicione no panel de baixo.
//		aparentemente fácil =D
//		Vector<File> filesVector = new Vector<File>();
		
		if(node==null) return;
		
		
		File fileChild = (File)node.getUserObject();
		
		//cria um array de files contidos naquele icone selecionado
		File[] files =  fileChild.listFiles();
		
//		File[] onlyFiles;
		
	
		
		
		
		int j=0;		

		for(int i=0;i<files.length;i++){
			if(files[i].isFile())
				j++;
		}
		
		this.onlyFiles = new File[j];
		for(int i=0, k=0;i<files.length;i++){
			if(files[i].isFile()){
				this.onlyFiles[k] = new File(files[i].getPath());
				k++;
			}
		}
		
		for(int i=0;i<this.onlyFiles.length;i++){
			System.out.println(this.onlyFiles[i].getName());
		}
		
		
	}

public void valueChanged(TreeSelectionEvent e) {
		DefaultMutableTreeNode node = (DefaultMutableTreeNode)
										tree.getLastSelectedPathComponent();

		if(node==null) return;
		
		File fileChild = (File)node.getUserObject();

		//aqui é a parte em que ele deveria "contruir" o painel de baixo.	
		this.treeFiles = this.buildTreeFiles(node, fileChild);
		this.treeFiles.setRootVisible(true);
		this.treeFiles.setVisible(true);
		this.panelFiles.add(this.treeFiles);
	}

	private JTree buildTreeFiles(DefaultMutableTreeNode node, File dir) {

		int cont=0;
		JTree tree = new JTree(node);
		File[] filesAndDir;
		File[] onlyFiles;

		//armazena em filesAndDir todos os arquivos e diretorios contidos em dir
		filesAndDir = dir.listFiles();
		
		//conta tão somente quantos arquivos contém em filesAndDir
		for (int i = 0; i < filesAndDir.length; i++) 
			if(filesAndDir[i].isFile())
				cont++;
		
		//um array somente com os arquivos contido na pasta dir
		onlyFiles = new File[cont];
		
		for (int i = 0; i < onlyFiles.length; i++) {
			if(onlyFiles[i].isDirectory()){
				
			}
			else{
				DefaultMutableTreeNode child = new DefaultMutableTreeNode(onlyFiles[i]);
				node.add(child);
			}
		}
		return tree;	
	}
}

if(filesAndDir[i].isFile())