SplitContainerControl重绘制分隔符

 /// <summary>
        /// 重写绘制事件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            if (splitterImage != null)
            {
                //清除原始的三角形
                e.Graphics.SetClip(this.SplitterBounds);
                e.Graphics.Clear(this.BackColor);
                //重绘制成自定义图片
                Rectangle mRectanle = new Rectangle(this.SplitterBounds.X, (base.Height - splitterImage.Height) / 2, splitterImage.Width, splitterImage.Height);
                e.Graphics.DrawImage(splitterImage, mRectanle);
            }
        }