自定义TableLayoutPanel出错


    public partial class MyTableLayoutPanel :TableLayoutPanel
    {
        [Description("边框颜色"), Category("BorderColor"), DefaultValue(typeof(Color), "Black")]
        private Color borderColor = Color.Black;
        public Color BorderColor
        {
            get { return borderColor; }
            set
            {
                this.borderColor = value;
                this.Invalidate();
            }
        }        public MyTableLayoutPanel()
        {
            InitializeComponent();
        }
        protected override void OnCellPaint(TableLayoutCellPaintEventArgs e)
        {
            base.OnCellPaint(e);
            Graphics g = e.Graphics;            Pen myPen = new Pen(borderColor);
            g.DrawRectangle(myPen,
                e.CellBounds.Location.X + 1,
                e.CellBounds.Location.Y + 1,
                e.CellBounds.Width,
                e.CellBounds.Height);        }
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.DrawRectangle(new Pen(borderColor), e.ClipRectangle.Location.X, e.ClipRectangle.Location.Y, e.ClipRectangle.Width - 1, e.ClipRectangle.Height - 1);
        }
    }
将这个自定义控件添加到工具箱里面，然后在拖放到窗体上时，提示：索引超出范围，必须为非负值必须小于集合大小，参数名：index
额，没分了