哪个高手帮帮忙，急啊。
谢谢了！

用不着这么复杂的, 在窗体上放一个contextMenuStrip 控件,在上面编辑子项,双击子项,程序自动会在
代码里添加事件的,你在里面写入详细处理方法就行了

主要是封装，不然当然是拖控件好。
这是以前做毕业设计时用到的。
下面是写好的代码：
//右键菜单——————————————————————————————
        public virtual ContextMenuStrip GetContextMenuStrip()
        {
            ContextMenuStrip strip = new ContextMenuStrip();

            ToolStripMenuItem LineWidth = new ToolStripMenuItem("线宽");
            strip.Items.Add(LineWidth + "", null, SetLineWidth);

            ToolStripMenuItem LineColor = new ToolStripMenuItem("线色");
            strip.Items.Add(LineColor + "", null, SetLineColor);

            ToolStripMenuItem LineStyle = new ToolStripMenuItem("线型");
            ToolStripMenuItem Dash = new ToolStripMenuItem("虚线");
            ToolStripMenuItem DashDot = new ToolStripMenuItem("点划线");
            ToolStripMenuItem DashDotDot = new ToolStripMenuItem("点点划线");
            ToolStripMenuItem Dot = new ToolStripMenuItem("点线");
            ToolStripMenuItem Solid = new ToolStripMenuItem("实线");

            ToolStripMenuItem MenuItemDelete = new ToolStripMenuItem("删除");
            strip.Items.Add(MenuItemDelete + "", null, SetDelete);

            LineStyle.DropDownItems.Add(Dash+"",null,SetDash);
            LineStyle.DropDownItems.Add(DashDot+"",null,SetDashDot); 
            LineStyle.DropDownItems.Add(DashDotDot+"",null,SetDashDotDot); 
            LineStyle.DropDownItems.Add(Dot+"",null,SetDot); 
            LineStyle.DropDownItems.Add(Solid+"",null,SetSolid);
            strip.Items.Add(LineStyle);
            return strip;
        }

         protected void SetDelete(object sender, System.EventArgs e)
         {
             graphControl1.Shapes.Remove(this);
             graphControl1.Invalidate();
         }

        protected void SetLineWidth(object sender, System.EventArgs e)
        {
            PenWidthFrm frm = new PenWidthFrm();
            if (frm.ShowDialog() == DialogResult.OK)
            {
                PenWidth = Convert.ToInt32(frm.outText);
                graphControl1.Invalidate();
            }
        }
        protected void SetLineColor(object sender, System.EventArgs e)
        {
            ColorDialog colorDialog1 = new ColorDialog();
            if (colorDialog1.ShowDialog() == DialogResult.OK)
            {
                PenColor = colorDialog1.Color;
                BrushColor = colorDialog1.Color;
                graphControl1.Invalidate();
            }
        }
        protected void SetLineStyle(object sender, System.EventArgs e)
        {
            ColorDialog colorDialog1 = new ColorDialog();
            if (colorDialog1.ShowDialog() == DialogResult.OK)
            {
                PenColor = colorDialog1.Color;
                graphControl1.Invalidate();
            }
        }

         protected void SetDash(object sender, System.EventArgs e)
         {
             Style = DashStyle.Dash;
             graphControl1.Invalidate();

         }
         protected void SetDashDot(object sender, System.EventArgs e)
         {
             Style = DashStyle.DashDot;
             graphControl1.Invalidate();
         }
         protected void SetDashDotDot(object sender, System.EventArgs e)
         {
             Style = DashStyle.DashDotDot;
             graphControl1.Invalidate();

         }
         protected void SetDot(object sender, System.EventArgs e)
         {
             Style = DashStyle.Dot;
             graphControl1.Invalidate();
         }
         protected void SetSolid(object sender, System.EventArgs e)
         {
             Style = DashStyle.Solid;
             graphControl1.Invalidate();
         }
调用时：
this.ContextMenuStrip = obj.GetContextMenuStrip();

其实这样做更加灵活，方便。