Changing the color of ComboBox's highlighter in C#

private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
{
    e.DrawBackground();
    int index = e.Index;
    CombinationEntry aFunction = comboBox1.Items[index] as CombinationEntry;  //CombinationEntry is a custom object to hold the gray info. Gray if not available and black if available
    if (aFunction.myIsAvailable)
    {
        e.Graphics.DrawString(aFunction.ToString(), new Font("Arial", 10, FontStyle.Regular, GraphicsUnit.Pixel), Brushes.Black, new Point(e.Bounds.X, e.Bounds.Y));
    }
    else
    {
        e.Graphics.DrawString(aFunction.ToString(), new Font("Arial", 10, FontStyle.Regular, GraphicsUnit.Pixel), Brushes.Gray, new Point(e.Bounds.X, e.Bounds.Y));
    }
}

SystemColors.WindowText

SystemColors.HighlightText

e.State == DrawItemState.Selected ?
    SystemBrushes.HighlightText : SystemBrushes.WindowText

SystemBrushes.GrayText

comboBox1.Font

if (e.State == ((DrawItemState.NoAccelerator | DrawItemState.NoFocusRect) |
                (DrawItemState.Selected |
                 DrawItemState.NoAccelerator |
                 DrawItemState.NoFocusRect)))
{
    e.Graphics.DrawString(aFunction.ToString(),
                          new Font("Arial", 10, FontStyle.Regular,
                                   GraphicsUnit.Pixel),
                          SystemBrushes.HighlightText,
                          new Point(e.Bounds.X, e.Bounds.Y));
}