public CategoryImmediateEditor(JTree tree,
    CategoryNodeRenderer renderer,
    CategoryNodeEditor editor) 
{
  //--------------------------------------------------------------------------
  //   Private Variables:
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  //   Constructors:
  //--------------------------------------------------------------------------
    super(tree, renderer, editor);
    this.renderer = renderer;
    renderer.setIcon(null);
    renderer.setLeafIcon(null);
    renderer.setOpenIcon(null);
    renderer.setClosedIcon(null);
    super.editingIcon = null;
}

 protected boolean canEditImmediately(EventObject e) 
{
    boolean rv = false;
    if (e instanceof MouseEvent) {
      MouseEvent me = (MouseEvent) e;
      rv = inCheckBoxHitRegion(me);
    }
    return rv;
}

 protected  void determineOffset(JTree tree,
    Object value,
    boolean isSelected,
    boolean expanded,
    boolean leaf,
    int row) 
{
    // Very important: means that the tree won't jump around.
    offset = 0;
}

 public boolean inCheckBoxHitRegion(MouseEvent e) 
{
    TreePath path = tree.getPathForLocation(e.getX(),
        e.getY());
    if (path == null) {
      return false;
    }
    CategoryNode node = (CategoryNode) path.getLastPathComponent();
    boolean rv = false;
    if (true) {
      // offset and lastRow DefaultTreeCellEditor
      // protected members
      Rectangle bounds = tree.getRowBounds(lastRow);
      Dimension checkBoxOffset =
          renderer.getCheckBoxOffset();
      bounds.translate(offset + checkBoxOffset.width,
          checkBoxOffset.height);
      rv = bounds.contains(e.getPoint());
    }
    return true;
}

 public boolean shouldSelectCell(EventObject e) 
{
    boolean rv = false;  // only mouse events
    if (e instanceof MouseEvent) {
      MouseEvent me = (MouseEvent) e;
      TreePath path = tree.getPathForLocation(me.getX(),
          me.getY());
      CategoryNode node = (CategoryNode)
          path.getLastPathComponent();
      rv = node.isLeaf() /*|| !inCheckBoxHitRegion(me)*/;
    }
    return rv;
}