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一、增强功能说明：

１、toolStripSplitButton下拉项显示当项(勾选)，并且其他的下拉项全部去掉勾

２、同步toolStripSplitButton与其下拉项

３、增加一事件 menuItemAdded　，当增加下拉MenuItem项后发生

４、增加方法：

　　　SyncToButton：　同步按钮与其下拉菜单项

　　　ButtonAddMenuItem　：代码增加MenuItem

　　　DoMenuItemClick        : 选择当前项，去掉未选择项

二、代码如下

 public partial class MyBindingNavigator : System.Windows.Forms.BindingNavigator
    {
        /// <summary>
        /// 2、定义委托
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public delegate void CustomEventHandler(object sender, CustomEventArgs e);

        /// <summary>
        /// 1、定义事件参数
        /// </summary>       
        public sealed class CustomEventArgs : EventArgs
        {
            private string  menuItemText ;
            public CustomEventArgs(string  strmenuItemText)
            {
                this.menuItemText = strmenuItemText;
            }
            public string  Flag
            {
                get { return menuItemText; }
            }
        }

        /// <summary>
        /// 3、定义事件
        /// </summary>
        [Browsable(true ) ,Description("当增加下拉MenuItem项后发生")]
        public event CustomEventHandler menuItemAdded;

        /// <summary>
        /// 4、执行事件
        /// </summary>
        /// <param name="e"></param>
        protected virtual void OnmenuItemAdded(CustomEventArgs e)
        {
            if (menuItemAdded != null)
            {
                menuItemAdded(this, e);
            }
        }

        ToolStripSplitButton _toolSpButton;

        public MyBindingNavigator()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 同步按钮与其下拉菜单项
        /// </summary>
        /// <param name="spButton"></param>
        /// <param name="strButtonCaption"></param>
        public void SyncToButton(ToolStripSplitButton spButton,string strButtonCaption )
        {
            _toolSpButton = spButton;

            _toolSpButton.SyncToDeault(strButtonCaption);

            InitializeComponent();
        }

        public virtual void ButtonAddMenuItem(object sender,EventArgs e,ToolStripSplitButton tspButton, ToolStripMenuItem itemMenu)
        {           
            itemMenu.Click += new System.EventHandler(DoMenuItemClick);           
         
            tspButton.DropDownItems.Add(itemMenu);
         
            // 5、触发事件
            string testFlag = itemMenu.Text;
            CustomEventArgs eArgs = new CustomEventArgs(testFlag);
           
            OnmenuItemAdded (eArgs);
        }

        /// <summary>
        /// 选择当前项，去掉未选择项
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public virtual  void DoMenuItemClick (object sender, EventArgs e)
        {
            //去掉所有勾
            foreach (ToolStripMenuItem it in ((ToolStripMenuItem)sender).Owner.Items)
            {
                if (it.Name == ((ToolStripItem)(((ToolStripMenuItem)sender))).Name)
                {
                    ((ToolStripMenuItem)(((ToolStripMenuItem)sender).Owner.Items[it.Name])).Checked = true;
                }
                else
                {
                    ((ToolStripMenuItem)(((ToolStripMenuItem)sender).Owner.Items[it.Name])).Checked = false;
                }
            }

        }
    }

    /// <summary>
    /// 同步类
    /// </summary>
    static class MenuExtend
    {
        public static void SyncToDeault(this ToolStripSplitButton button,string  strButtonCaption)
        {
            Action<ToolStripSplitButton, ToolStripItem> synchanlder = (splitButton, item) =>
            {
                splitButton.DefaultItem = item;
                splitButton.Text = strButtonCaption + item.Text;
                splitButton.ToolTipText = strButtonCaption + item.ToolTipText;
            };

            if (button.DropDownItems.Count > 0)
            {
                synchanlder(button, button.DropDownItems[0]);
            }           
            button.DropDownItemClicked += (sender, args) => synchanlder((ToolStripSplitButton)sender, args.ClickedItem);
        }
    }