winform自定义按钮类，去除按钮设置透明后，点击出现黑边框

自定义按钮类，去除按钮设置透明后，点击出现黑边框

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
    class cmpbutton : Button
    {
        public cmpbutton()
        {
        }

        protected override bool ShowFocusCues
        {
            get
            {
                return false;
            }
        }
    }
}