[c#] How do I put text on ProgressBar?

I tried placing a label with transparent background over a progress bar but never got it to work properly. So I found Barry's solution here very useful, although I missed the beautiful Vista style progress bar. So I merged Barry's solution with http://www.dreamincode.net/forums/topic/243621-percent-into-progress-bar/ and managed to keep the native progress bar, while displaying text percentage or custom text over it. I don't see any flickering in this solution either. Sorry to dig up and old thread but I needed this today and so others may need it too.

public enum ProgressBarDisplayText
{
    Percentage,
    CustomText
}

class ProgressBarWithCaption : ProgressBar
{
    //Property to set to decide whether to print a % or Text
    private ProgressBarDisplayText m_DisplayStyle;
    public ProgressBarDisplayText DisplayStyle {
        get { return m_DisplayStyle; }
        set { m_DisplayStyle = value; }
    }

    //Property to hold the custom text
    private string m_CustomText;
    public string CustomText {
        get { return m_CustomText; }
        set {
            m_CustomText = value;
            this.Invalidate();
        }
    }

    private const int WM_PAINT = 0x000F;
    protected override void WndProc(ref Message m)
    {
        base.WndProc(m);

        switch (m.Msg) {
            case WM_PAINT:
                int m_Percent = Convert.ToInt32((Convert.ToDouble(Value) / Convert.ToDouble(Maximum)) * 100);
                dynamic flags = TextFormatFlags.VerticalCenter | TextFormatFlags.HorizontalCenter | TextFormatFlags.SingleLine | TextFormatFlags.WordEllipsis;

                using (Graphics g = Graphics.FromHwnd(Handle)) {
                    using (Brush textBrush = new SolidBrush(ForeColor)) {

                        switch (DisplayStyle) {
                            case ProgressBarDisplayText.CustomText:
                                TextRenderer.DrawText(g, CustomText, new Font("Arial", Convert.ToSingle(8.25), FontStyle.Regular), new Rectangle(0, 0, this.Width, this.Height), Color.Black, flags);
                                break;
                            case ProgressBarDisplayText.Percentage:
                                TextRenderer.DrawText(g, string.Format("{0}%", m_Percent), new Font("Arial", Convert.ToSingle(8.25), FontStyle.Regular), new Rectangle(0, 0, this.Width, this.Height), Color.Black, flags);
                                break;
                        }

                    }
                }

                break;
        }

    }

}