/// <summary>
 /// 构造函数
 ///     创建<c>WSNToolTipManager</c>
 /// </summary>
 public WSNToolTipManager()
 {
     wsnToolTip = new WSNToolTip();
     pOwner = IntPtr.Zero;
 }
 /// <summary>
 /// 释放资源
 /// </summary>
 public void Dispose()
 {
     try
     {
         wsnToolTip.Dispose();
         wsnToolTip = null;
         instance = null;
     }
     catch
     {
         return;
     }
 }