C# ToolStrip.ItemClicked 事件不能响应二级菜单(子菜单)的解决方法

/// <summary>
/// 绑定响应事件
/// </summary>
this.ListMenu.ItemClicked += new System.Windows.Forms.ToolStripItemClickedEventHandler(this.ListMenu_ItemClicked);

/// <summary>
/// 响应ItemMenu右键菜单
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ItemMenu_ItemClicked(Object sender, ToolStripItemClickedEventArgs e)
{
        //code...
}/// <summary>
/// 绑定响应事件
/// </summary>
this