Hi

 I am discovering the Swing's tree API.  I am building a
tree one node after the other (the nodes reflect different
steps of a long-running process).

 The problem is that the nodes added after the construction
of the tree are not shown.  I guess I have to tell the tree
in some way that the tree model has changed, but I don't
know how.

 Below is a full simple sample that reproduce the same
issue I have, I think:

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.WindowConstants;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class TreeAddNodes
{
   public static void main(String[] args)
   {
       // first part of the model
       DefaultMutableTreeNode root =
           new DefaultMutableTreeNode("node 1");
       root.add(new DefaultMutableTreeNode("node 2"));
       root.add(new DefaultMutableTreeNode("node 3"));

       // the model and the tree
       JTree tree = new JTree(new DefaultTreeModel(root));

       // second part of the model, NOT SHOWN!
       root.add(new DefaultMutableTreeNode("node 4"));
       root.add(new DefaultMutableTreeNode("node 5"));

       // GUI boilerplate
       JFrame frame = new JFrame();
       frame.setDefaultCloseOperation(
                     WindowConstants.EXIT_ON_CLOSE);
       frame.setSize(200, 200);
       frame.add(tree);
       frame.show();
   }
}

 Any comment greatly appraciated!

 Regards,

--drkm