/// <summary>
 /// 插入子窗口
 /// </summary>
 /// <param name="window"></param>
 private void InsertWindow(SubWindow window)
 {
     window.AddCloseEventListener(this.m_OnSubWindowClose);
     if (this.m_Root == null)
     {
         this.m_Root = new SubWindowNode(true, 0);
     }
     this.m_Root.AddWindow(window, 0);
 }