Можно ли добиться полупрозрачности кнопки

public class TransparentButton:Control
    {
        double alpha = 0.5;
        bool focused = false;
 
        public TransparentButton()
        {
            SetStyle(ControlStyles.SupportsTransparentBackColor|ControlStyles.OptimizedDoubleBuffer, true);
            Invalidate();
        }
 
        private unsafe Image GetTransparentImage(Image original, double alpha)
        {
            Bitmap bmp = new Bitmap(original);
            System.Drawing.Imaging.BitmapData bmp_data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            byte* start_byte = (byte*)bmp_data.Scan0;
            int count_bytes = bmp_data.Stride * bmp.Height;
            for (int i = 0; i < count_bytes; i += 4)
                if (*(start_byte + i + 3) != 0)
                    *(start_byte + i + 3) = (byte)(*(start_byte + i + 3) * alpha);
            bmp.UnlockBits(bmp_data);
            return bmp;
        }
 
        protected override void OnMouseLeave(EventArgs e)
        {
            focused = false;
            this.Invalidate();
            base.OnMouseLeave(e);
        }
 
        protected override void OnMouseEnter(EventArgs e)
        {
            focused = true;
            this.Invalidate();
            base.OnMouseEnter(e);
        }
 
        protected override void OnPaint(PaintEventArgs e)
        {            
            Bitmap bmp = new Bitmap(this.Width, this.Height);
            Graphics g = Graphics.FromImage(bmp);
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
            if (!focused)
            {
                ButtonRenderer.DrawButton(g, new Rectangle(0, 0, this.Width, this.Height), this.Text, this.Font, TextFormatFlags.VerticalCenter | TextFormatFlags.WordEllipsis | TextFormatFlags.HorizontalCenter, focused, System.Windows.Forms.VisualStyles.PushButtonState.Normal);
                bmp = new Bitmap(GetTransparentImage(bmp, alpha));
            }
            else
                ButtonRenderer.DrawButton(g, new Rectangle(0, 0, this.Width, this.Height), this.Text, this.Font, TextFormatFlags.VerticalCenter | TextFormatFlags.WordEllipsis | TextFormatFlags.HorizontalCenter, focused, System.Windows.Forms.VisualStyles.PushButtonState.Hot);
            e.Graphics.DrawImage(bmp,0,0,this.Width,this.Height);
            base.OnPaint(e);
        }
    }