Hola muchachos como les va? quiero setear en mi JTree iconos fijos en mi JTree. es decir quiero que siempre aparezca x icono cuando abro, cierro un nodo.
logre cambiar los iconos pero cuando abro o cierro, o creo un nuevo nodo me los cambia..

aqui les dejo el código fuente de mi programa:
package korg.sample.tool;

import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTree;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.GridLayout;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.swing.tree.TreeSelectionModel;
import javax.swing.tree.DefaultTreeCellRenderer;

class KSTool extends JFrame {

private JPanel contentPane;
private JLabel picLabel;
private BufferedImage myPicture = null;
private JMenuBar menuBar = new JMenuBar();
private JMenu File = new JMenu("File");
private JMenu Edit = new JMenu("Edit");
private JMenu View = new JMenu("View");
private JMenu Options = new JMenu("Options");
private JMenu Help = new JMenu("Help");
private JMenuItem openFile = new JMenuItem("Open File");
private JMenuItem saveFile = new JMenuItem("Save Collection");
private JMenuItem saveCollection = new JMenuItem("Save Collection as...");
private JMenuItem clearAll = new JMenuItem("Clear All");
private JMenuItem recentFiles = new JMenuItem("Recent Files");
private JMenuItem exitMenu = new JMenuItem("Exit");
private JMenuItem nuevoIns = new JMenuItem("Add new instrument");
private JMenuItem nuevoLayer = new JMenuItem("Add new layer");
private JMenuItem editItem = new JMenuItem("Edit item name");
private JMenuItem deleteItem = new JMenuItem("Delete item");
private JMenuItem runWaveform = new JMenuItem("Run Waveform Editor");
private JMenuItem appProperties = new JMenuItem("Properties");
private JMenuItem playAudio = new JMenuItem("Play Audio");
private JMenuItem itemCount = new JMenuItem("Item Count");
private JMenuItem appPreferences = new JMenuItem("Preferences");
private JMenuItem AboutUs = new JMenuItem("About KSTool");
private JSeparator jSeparator1 = new JSeparator();
private JSeparator jSeparator2 = new JSeparator();
private JSeparator jSeparator3 = new JSeparator();
private JSeparator jSeparator4 = new JSeparator();
private JSeparator jSeparator5 = new JSeparator();
private JSeparator jSeparator6 = new JSeparator();
private JScrollPane jScrollPane1 = new JScrollPane();
private JTree instrumentTree;
private DefaultMutableTreeNode treeNode = new DefaultMutableTreeNode();
private String metaImgFilepath = new String();
private MetaFileHeader myHeader = new MetaFileHeader();
private Multisample myMultisampleInfo = new Multisample();
private Multisample[] myMSList;
private int currentMultisample = 0;
private int currentMultisampleDescription = 0;
private static String ADD_COMMAND = "add";
private static String REMOVE_COMMAND = "remove";
private static String CLEAR_COMMAND = "clear";
private JPopupMenu popup = new JPopupMenu();
private JMenuItem addIn = new JMenuItem("Add instrument");

/*Nombre de la Aplicacion, Size, etc */
public KSTool() {
super("Korg Sample Tools");
setDefaultCloseOperation(3);
setBounds(100, 100, 650, 500);
try
{
this.myPicture = ImageIO.read(getClass().getResource("icon.png"));
}
catch (IOException e)
{
e.printStackTrace();
}
this.picLabel = new JLabel(new ImageIcon(this.myPicture));



//Crea Collection
final DefaultMutableTreeNode collection = new DefaultMutableTreeNode("Collection");

//Crea nodos de Instrumento
//DefaultMutableTreeNode instrumentNode = new DefaultMutableTreeNode("Instrumentos");
//instrumentNode.add(new DefaultMutableTreeNode("Instrumentos"));

//collection.add(instrumentNode);

instrumentTree = new JTree(collection);
add(instrumentTree);
add(new JScrollPane(instrumentTree));
instrumentTree.setEditable(true);
instrumentTree.setPreferredSize(new Dimension(400, 700));

ImageIcon imageIcon = new ImageIcon(KSTool.class.getResource("collection.png"));
//ImageIcon insIcon = new ImageIcon(KSTool.class.getResource("keyboard.gif"));
DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
//DefaultTreeCellRenderer open = new DefaultTreeCellRenderer();
renderer.setOpenIcon(imageIcon);
//open.setClosedIcon(insIcon);
instrumentTree.setCellRenderer(renderer);
// instrumentTree.setCellRenderer(open);

//addIn.addActionListener(this);
//addIn.addActionCommand("Add");
popup.add(addIn);



setJMenuBar(menuBar);

menuBar.add(File);
File.add(openFile);
File.add(jSeparator1);
File.add(saveFile);
this.saveFile.setEnabled(false);
File.add(saveCollection);
this.saveCollection.setEnabled(false);
File.add(jSeparator2);
File.add(clearAll);
File.add(recentFiles);
File.add(jSeparator3);
File.add(exitMenu);

openFile.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0)
{
JFileChooser fileChooser = new JFileChooser();
int returnVal = fileChooser.showOpenDialog(null);
if (returnVal == 0)
{
KSTool.this.metaImgFilepath = fileChooser.getSelectedFile().getPath();
KSTool.this.myHeader.readMetaFileHeader(KSTool.this.metaImgFilepath);
if (KSTool.this.myHeader.getIdKorg() != null)
{
System.out.println("Open File access granted.");
System.out.println("Loaded " + KSTool.this.myHeader.getNbMultisample() + " Instrumens and " + KSTool.this.myHeader.getNbWaveformDescription() + " Waveforms Samples.");
KSTool.this.currentMultisample = 0;
KSTool.this.currentMultisampleDescription = 0;
System.out.println("Instruments Samples correctly loaded");

KSTool.this.saveFile.setEnabled(true);
KSTool.this.saveCollection.setEnabled(true);
System.out.println("Save Menus Activated");
KSTool.this.runWaveform.setEnabled(true);
System.out.println("Run Waveform Menu Activated");
KSTool.this.appProperties.setEnabled(true);
System.out.println("View - Properties Menu Activated");
KSTool.this.playAudio.setEnabled(true);
System.out.println("View - Play Audio Menu Activated");

//Crea el nombre del archivo .ksc
//KSTool.this.treeNode = new DefaultMutableTreeNode();
//Creacion y lectura de los instrumentos

for(KSTool.this.currentMultisample = 0;KSTool.this.currentMultisample <= 99 ;KSTool.this.currentMultisample++)
{
DefaultMutableTreeNode instrumentNode = new DefaultMutableTreeNode(KSTool.this.myMultisampleInfo.readMultisampleInfo(KSTool.this.metaImgFilepath, KSTool.this.currentMultisample));
instrumentNode.add(new DefaultMutableTreeNode(KSTool.this.myMultisampleInfo.getMultisampleName()));
collection.add(instrumentNode);}

KSTool.this.repaint();
}
else
{
System.out.println("File access canceled by user");
}
}
}});

exitMenu.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
System.exit(0);
}
});


menuBar.add(Edit);

Edit.add(nuevoIns);
nuevoIns.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
for(int nbProgram = 0; nbProgram <= 0; nbProgram++){
int bank = 0;
DefaultMutableTreeNode instrumentNode = new DefaultMutableTreeNode(bank + ":" + nbProgram++ + ":" + " " + "Instrument " + nbProgram++);
System.out.println("New Instrument added");
collection.add(instrumentNode);
}
}
});

Edit.add(nuevoLayer);
this.nuevoLayer.setEnabled(false);
nuevoLayer.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
int nbLayer = 0;
//if (nuevoIns.collection.add(instrumentNode)
}
});

Edit.add(jSeparator4);
Edit.add(editItem);
editItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{

}
});

Edit.add(deleteItem);
deleteItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
instrumentTree.remove(nuevoIns);
}
}
);


Edit.add(jSeparator5);
Edit.add(runWaveform);
this.runWaveform.setEnabled(false);

menuBar.add(View);
View.add(appProperties);
this.appProperties.setEnabled(false);
View.add(playAudio);
this.playAudio.setEnabled(false);
View.add(jSeparator6);
View.add(itemCount);

menuBar.add(Options);
Options.add(appPreferences);
menuBar.add(Help);
Help.add(AboutUs);
AboutUs.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
JFrame aboutFrame = new JFrame("About Us");
aboutFrame.setResizable(false);
aboutFrame.getContentPane().setLayout(new GridLayout(0, 2));
aboutFrame.getContentPane().add(KSTool.this.picLabel);

JLabel textLabel = new JLabel("Korg Sample Tools V0.5.5 (c) http://www.ks-tool.com 2014", 0);
aboutFrame.getContentPane().add(textLabel, "Center");

aboutFrame.pack();
aboutFrame.setVisible(true);
}
});

}

//Main : Inicio de Aplicación java
public static void main(String [] args){
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(KSTool.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(KSTool.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(KSTool.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(KSTool.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}

/* Crea y Muestra en pantalla la Aplicación */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new KSTool().setVisible(true);
}
});
}

}