C# 如何控制单选按钮的背景图像大小？

我有外观设置为按钮的单选按钮。我添加了背景图像。现在点击的效果并不明显，因为背景在按钮上方，不会受到影响

我认为最好将图像缩小，以便更清楚地知道选择了哪一个，但最好是整个单选按钮看起来自然按下7高亮显示/任何效果

谢谢

  this.radioButton3.Appearance = System.Windows.Forms.Appearance.Button;
  this.radioButton3.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
  this.radioButton3.Location = new System.Drawing.Point(137, 111);
  this.radioButton3.Name = "radioButton3";
  this.radioButton3.Size = new System.Drawing.Size(80, 31);
  this.radioButton3.TabIndex = 2;
  this.radioButton3.TabStop = true;
  this.radioButton3.UseVisualStyleBackColor = true;
  this.radioButton3.CheckedChanged += new    
  System.EventHandler(this.radioButton1_CheckedChanged);

当点击时，我想要改变

      if (control is RadioButton) {
      RadioButton radio = control as RadioButton;
      if (radio.Checked) {

      }
    }

---

让我看看你的密码，非常直接