@Nullable
  private DefaultMutableTreeNode getNode(final int row) {
    JTree tree = myTree;
    TreePath path = tree.getPathForRow(row);
    if (path != null) {
      return (DefaultMutableTreeNode)path.getLastPathComponent();
    }

    return null;

  }
@Nullable
  private DefaultMutableTreeNode getNode(final int row)