运行时选择界面上控件的方法

看到很多入门人员(C#我也是入门者)找如何在运行时选择界面上控件,因此写了这段代码,希望有所帮助.
用左键确定选择,选择后置控件的背景颜色(如能像微软一样显示一个句柄就更好,觉得不难)
        static Control oldCtr;
        static Color oldColor;
        private void timer1_Tick(object sender, EventArgs e)
        {
            //左键确认选择
            if (Control.MouseButtons == MouseButtons.Left)
            {
                Control ctr = FindControl(this);
                if (ctr != null)
                {
                    //复原先前控件属性
                    if (oldCtr != null)
                    {
                        oldCtr.BackColor = oldColor;
                    }
                    //保存选择并置选择状态
                    oldCtr = ctr;
                    oldColor = ctr.BackColor;
                    ctr.BackColor = Color.Red;
                }
            }
 
        }

        private Control FindControl(Control pControl)
        {
            Control ctr ;
            ctr = pControl.GetChildAtPoint(pControl.PointToClient(Control.MousePosition));
            //直接在容器中
            if (ctr != null)
            {
                //无子控件
                if (ctr.Controls.Count == 0)
                {
                    return (ctr);
                }
                else
                {
                    Control  ctr2 = FindControl(ctr);                       
                    if (ctr2 != null)
                    {
                        //子控件处于选择状态则返回子控件
                        return (ctr2);
                    }
                    else
                    {
                        //子控件不处于选择状态则返回容器控件
                        return (ctr);
                    }
                }
            }
            return (null);
        }