加掛 Class 的 event 處理函數
 public CustomColorCheckBox()  
{   
     this.checkColor = this.ForeColor;   
     this.Paint  += new PaintEventHandler(this.PaintHandler);          
     this.Click   += new EventHandler(this.OnClick1);  
     this.KeyUp += new KeyEventHandler(OnKeypress);
}
public void OnKeypress(object sender, KeyEventArgs e)    
{
MessageBox.Show(e.KeyCode.ToString(), "Your input");
}
MessageBox.Show(e.KeyCode.ToString(), "Your input");
}
        public void OnClick1(object sender, EventArgs e)
        {
            MessageBox.Show("Hello C#");
        }
 private void PaintHandler (object sender, PaintEventArgs pe) 
 { 
  if (this.Checked) 
  {
   Point pt = new Point();
   if (this.CheckAlign == ContentAlignment.BottomCenter)
   {
    pt.X = (this.Width / 2) - 4;
    pt.Y = this.Height - 11;
   }
   if (this.CheckAlign == ContentAlignment.BottomLeft)
   {
    pt.X = 3;
    pt.Y = this.Height - 11;
   }
   if (this.CheckAlign == ContentAlignment.BottomRight)
   {
    pt.X = this.Width - 11;
    pt.Y = this.Height - 11;
   }
   if (this.CheckAlign == ContentAlignment.MiddleCenter)
   {
    pt.X = (this.Width / 2) - 4;;
    pt.Y = (this.Height / 2) - 4;
   }
   if (this.CheckAlign == ContentAlignment.MiddleLeft)
   {
    pt.X = 3;
    pt.Y = (this.Height / 2) - 4;
   }
   if (this.CheckAlign == ContentAlignment.MiddleRight)
   {
    pt.X = this.Width - 11;
    pt.Y = (this.Height / 2) - 4;
   }
   if (this.CheckAlign == ContentAlignment.TopCenter)
   {
    pt.X = (this.Width / 2) - 4;
    pt.Y = 3;
   }
   if (this.CheckAlign == ContentAlignment.TopLeft)
   {
    pt.X = 3;
    pt.Y = 3;
   }
   if (this.CheckAlign == ContentAlignment.TopRight)
   {
    pt.X = this.Width - 11;
    pt.Y = 3;
   }
   DrawCheck(pe.Graphics, this.checkColor,pt);
  }
 }