Problems adding nodes to JTree on runtime

I have added a popup menu to my tree, and would like to be able to add new nodes by right clicking, so I have this code in my event listener:
void newFolderFolderPopup_mousePressed(MouseEvent e) {
  System.out.println("WEEEEEEEEEEEEEEEEEEEEEEEE");
  FolderDO folder = new FolderDO("New Folder");
  DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(folder);
  TreePath treePath = foldersTree.getSelectionPath();
  DefaultMutableTreeNode slectedNode = (DefaultMutableTreeNode)treePath.getLastPathComponent();
  treeModel.insertNodeInto(newNode,slectedNode,slectedNode.getChildCount());
  foldersTree.scrollPathToVisible(new TreePath(newNode.getPath()));
}If the slected node is a leaf, it works just fine every time I do it. But if the selected node has children and it has once been expanded, the new node is not displayed (but something strange is happening to the tree). If however the selected node has children and has not been expanded it works fine...???
Any ideas?

I have added a popup menu to my tree, and would like to be able to add new nodes by right clicking, so I have this code in my event listener:
void newFolderFolderPopup_mousePressed(MouseEvent e) {
  System.out.println("WEEEEEEEEEEEEEEEEEEEEEEEE");
  FolderDO folder = new FolderDO("New Folder");
  DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(folder);
  TreePath treePath = foldersTree.getSelectionPath();
  DefaultMutableTreeNode slectedNode = (DefaultMutableTreeNode)treePath.getLastPathComponent();
  treeModel.insertNodeInto(newNode,slectedNode,slectedNode.getChildCount());
  foldersTree.scrollPathToVisible(new TreePath(newNode.getPath()));
}If the slected node is a leaf, it works just fine every time I do it. But if the selected node has children and it has once been expanded, the new node is not displayed (but something strange is happening to the tree). If however the selected node has children and has not been expanded it works fine...???
Any ideas?

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    NOTICE: clcomm: Path n20-1-sup:qfe5 - n20-2-sup:qfe5 online
    NOTICE: clcomm: Path n20-1-sup:qfe1 - n20-3-sup:qfe1 being initiated
    NOTICE: clcomm: Path n20-1-sup:qfe1 - n20-3-sup:qfe1 online
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    NOTICE: CMM: Node n20-3-sup (nodeid = 3) is up; new incarnation number = 1205265086.
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    Mar 13 14:02:23 in.ndpd[351]: solicit_event: giving up on qfe5
    did subpath /dev/rdsk/c1t3d0s2 created for instance 2.
    did subpath /dev/rdsk/c2t3d0s2 created for instance 12.
    did subpath /dev/rdsk/c1t3d1s2 created for instance 3.
    did subpath /dev/rdsk/c1t3d2s2 created for instance 6.
    did subpath /dev/rdsk/c1t3d3s2 created for instance 7.
    did subpath /dev/rdsk/c1t3d4s2 created for instance 8.
    did subpath /dev/rdsk/c1t3d5s2 created for instance 9.
    did subpath /dev/rdsk/c1t3d6s2 created for instance 10.
    did subpath /dev/rdsk/c1t3d7s2 created for instance 11.
    did subpath /dev/rdsk/c2t3d1s2 created for instance 13.
    did subpath /dev/rdsk/c2t3d2s2 created for instance 14.
    did subpath /dev/rdsk/c2t3d3s2 created for instance 15.
    did subpath /dev/rdsk/c2t3d4s2 created for instance 16.
    did subpath /dev/rdsk/c2t3d5s2 created for instance 17.
    did subpath /dev/rdsk/c2t3d6s2 created for instance 18.
    did subpath /dev/rdsk/c2t3d7s2 created for instance 19.
    did instance 20 created.
    did subpath n20-1-sup:/dev/rdsk/c0t6d0 created for instance 20.
    did instance 21 created.
    did subpath n20-1-sup:/dev/rdsk/c3t0d0 created for instance 21.
    did instance 22 created.
    did subpath n20-1-sup:/dev/rdsk/c3t1d0 created for instance 22.
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    t_optmgmt: System error: Cannot assign requested address
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