Double buffering problem of a derived owner-drawn TabControl?

class DoubleBufferedTabControl : TabControl
{
    public DoubleBufferedTabControl() : base()
    {
    	this.DoubleBuffered = true;
    	this.SetStyle
    	    (
    	        ControlStyles.UserPaint |
    	        ControlStyles.AllPaintingInWmPaint |
    	        ControlStyles.ResizeRedraw |
    	        ControlStyles.OptimizedDoubleBuffer |
    	        ControlStyles.SupportsTransparentBackColor,
    	        false
    	    );
    }
}

private void Navigation_PageContent_DrawItem(object sender, DrawItemEventArgs e)
	{
		//Structure.
		Graphics g = e.Graphics;
		TabControl t = (TabControl)sender;
		TabPage CurrentPage = t.TabPages[e.Index];

		//Get the current tab
		Rectangle CurrentTabRect = t.GetTabRect(e.Index);

		//Get the last tab.
		Rectangle LastTab = t.GetTabRect(t.TabPages.Count - 1);

		//Main background rectangle.
		Rectangle BackgroundRect = new Rectangle(LastTab.Width, t.Bounds.Y - 4, t.Width - (LastTab.Width), t.Height);

		//Tab background rectangle.
		Rectangle TabBackgroundRect = new Rectangle(0, LastTab.Y + LastTab.Height, LastTab.Width, t.Bounds.Height - (LastTab.Y + LastTab.Height));

		//Set anitialiasing for the text.
		e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;

		//String format for the text.
		StringFormat StringFormat = new StringFormat();
		StringFormat.Alignment = StringAlignment.Center;
		StringFormat.LineAlignment = StringAlignment.Center;

		//Fill the background.
		g.FillRectangle(Brushes.LightGray, BackgroundRect);
		g.FillRectangle(Brushes.Bisque, TabBackgroundRect);

		//Draw the selected tab.
		if(e.State == DrawItemState.Selected)
		{
			g.FillRectangle(Brushes.White, e.Bounds);
			Rectangle SelectedTabOutline = new Rectangle(e.Bounds.X + 2, e.Bounds.Y + 2, e.Bounds.Width, e.Bounds.Height - 4);
			g.DrawRectangle(new Pen(Brushes.LightGray, 4f), SelectedTabOutline);
			g.DrawString(CurrentPage.Text, new Font("Arial", 12f, FontStyle.Bold, GraphicsUnit.Point), new SolidBrush(Color.FromArgb(70, 70, 70)), CurrentTabRect, StringFormat);
		}
		else
		{
			g.FillRectangle(new SolidBrush(Color.FromArgb(230, 230, 230)), e.Bounds);
			g.DrawString(CurrentPage.Text, new Font("Arial", 12f, FontStyle.Regular, GraphicsUnit.Point), Brushes.Gray, CurrentTabRect, StringFormat);
		}

	}

protected override CreateParams CreateParams
{
	get
	{
		CreateParams cp = base.CreateParams;
		cp.ExStyle |= 0x02000000;
		return cp;
	}
}

protected override void OnPaintBackground( PaintEventArgs pevent )
{
    //do not call base - I don't want the background re-painted!
}