Colored background dropdownlist in combobox

Hello, i have a problem with coloring background in combobox..
http://www.youtube.com/watch?v=2pHykCwn3_U

As you can see.. background is colored after mouse move on text.. what i should to do to get automatic colored background?

This works fine for me

Code:

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void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
        {
            if (e.Index < 0) return;

            if (comboBox1.Items[e.Index].ToString().Contains(".99."))
                e.Graphics.FillRectangle(new SolidBrush(Color.Red), (Rectangle)e.Bounds);

            e.Graphics.DrawString(comboBox1.Items[e.Index].ToString(), e.Font, new SolidBrush(comboBox1.ForeColor), new Point(e.Bounds.X, e.Bounds.Y));
        }

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Probably your error is that you don't use the item index

Thanks a lot, its working fine now