SysTrayIcon and Background Color

How would I place code to get the background a different color, instead of transparent to the systray?

Code:

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        private void CreateIcon(int temperature)
        {
            // Create a graphics instance that draws to a bitmap
            Bitmap bitmap = new Bitmap(16, 16,
                        System.Drawing.Imaging.PixelFormat.Format32bppArgb);

            Graphics graphics = Graphics.FromImage(bitmap);

            // FONT
            System.Drawing.Font drawFont
                      = new System.Drawing.Font("Segoe UI", 8,
                                            System.Drawing.FontStyle.Bold);

            // TEXT
            string drawString = temperature.ToString();

            SizeF drawStringSize = new SizeF();
            //Measure the Copyright string in this Font
            drawStringSize = graphics.MeasureString(drawString, drawFont);

            // BRUSH
            System.Drawing.SolidBrush drawBrush
                                    = new System.Drawing.SolidBrush(
                                        Color.FromArgb(255, 255, 255, 255));
            // center text in icon image
            graphics.DrawString(drawString, drawFont, drawBrush,
                  16 / 2 - drawStringSize.Width / 2, 16 / 2 - drawStringSize.Height / 2);

            notifyWeather.Icon = System.Drawing.Icon.FromHandle(bitmap.GetHicon());

            drawFont.Dispose();
            drawBrush.Dispose();
            graphics.Dispose();

        }

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Before drawing the text, do this:

Code:

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graphics.Clear(Color.Black);

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Replace Black with the color you want.

Thanks...