how to make the screen to move along with the JTree

[shalini gnana]

I'm creating a gantt chart..when i expand the tree the task coresponding to the leaf node have to show and if i close the leaf node,the corresponding task should not show..
How can i do it..I have created a tree..

    
package javaapplication2;
 
import java.awt.*;
import java.awt.Graphics2D;
//////import java.awt.Rectangle;
import javax.swing.JApplet;
import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.xml.parsers.SAXParserFactory;
 
public class reg extends JApplet 
{
         
JPanel rightPanel;
DefaultMutableTreeNode rootnode;
JTree tree;  
 
    public DefaultMutableTreeNode createNodes()
    {
 
        rootnode = new DefaultMutableTreeNode("RESOURCE");
        
        DefaultMutableTreeNode resource1 = new DefaultMutableTreeNode("RESOURCE1");
        DefaultMutableTreeNode resource2 = new DefaultMutableTreeNode("RESOURCE2");
        DefaultMutableTreeNode resource3 = new DefaultMutableTreeNode("RESOURCE3");
        
 
        rootnode.add(resource1);
        rootnode.add(resource2);
        rootnode.add(resource3);
        
        resource1.add(new DefaultMutableTreeNode("task1"));
        resource1.add(new DefaultMutableTreeNode("task2"));
        resource1.add(new DefaultMutableTreeNode("task3"));
        
        resource2.add(new DefaultMutableTreeNode("task1"));
        resource2.add(new DefaultMutableTreeNode("task2"));
        resource2.add(new DefaultMutableTreeNode("task3"));
        
        resource3.add(new DefaultMutableTreeNode("task1"));
        resource3.add(new DefaultMutableTreeNode("task2"));
        resource3.add(new DefaultMutableTreeNode("task3"));
        
        return rootnode;
    }
  
 public void init() 
 {  
     try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    } 
         catch (Exception evt) 
         {
         
         }
Container cont = getContentPane();       
 cont.setLayout(new BorderLayout());
 rightPanel = new JPanel()
 {  
 public void paintComponent (Graphics g)
   {
                        int x = 0;
for (int i=0; i<4; i++)
                        {
                            x += 70;
                            for(int j=0;j<4;j++)
                            {
                                g.drawString("1",x,0);
                            }

 
  g.drawRect( x,0,70,30)  ;
}   
}
};
cont.add(rightPanel, BorderLayout.CENTER); 
JScrollPane scroll = new JScrollPane(rightPanel);
cont.add(scroll);
rootnode = createNodes();  
tree = new JTree(rootnode);        
rightPanel.add(tree, BorderLayout.WEST); 
scroll.setViewportView(rightPanel) ;
} 
} 
 
 

[ October 22, 2007: Message edited by: shalini gnana ]