private void button1_Click(object sender, EventArgs e)
        {
            NodeForm nf = new NodeForm(owner);

            if (nf.ShowDialog() == DialogResult.OK)
            {
                AddNode(nf.Template);
            }
        }
 private void button2_Click(object sender, EventArgs e)
 {
     if (selected != null && SelectedNode != null)
     {
         NodeForm nf = new NodeForm(owner);
         nf.Template = selected;
         if (nf.ShowDialog() == DialogResult.OK)
         {
             UpdateNode(SelectedNode.Index, nf.Template);
         }
     }
     else
     {
         MessageBox.Show("请先选定一个要修改的节点!");
     }
 }