Iconos Pestañas

public Editor()
{
    InitializeComponent();

    tabControl1.TabPages[tabControl1.TabCount - 1].Text = "";
    tabControl1.Padding = new Point(12, 4);
    tabControl1.DrawMode = System.Windows.Forms.TabDrawMode.OwnerDrawFixed;

    tabControl1.DrawItem += tabControl1_DrawItem;
    tabControl1.MouseDown += tabControl1_MouseDown;
    tabControl1.Selecting += tabControl1_Selecting;
    tabControl1.HandleCreated += tabControl1_HandleCreated;
}

[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);
private const int TCM_SETMINTABWIDTH = 0x1300 + 49;

private void tabControl1_HandleCreated(object sender, EventArgs e)
{
    SendMessage(tabControl1.Handle, TCM_SETMINTABWIDTH, IntPtr.Zero, (IntPtr)16);
}
private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
{
    if (e.TabPageIndex == tabControl1.TabCount - 1)
        e.Cancel = true;
}
private void tabControl1_MouseDown(object sender, MouseEventArgs e)
{
    var lastIndex = tabControl1.TabCount - 1;
    if (tabControl1.GetTabRect(lastIndex).Contains(e.Location))
    {
        tabControl1.TabPages.Insert(lastIndex, "Sin título");
        tabControl1.SelectedIndex = lastIndex;
        tabControl1.TabPages[lastIndex].UseVisualStyleBackColor = true;
    }
    else
    {
        for (var i = 0; i < tabControl1.TabPages.Count; i++)
        {
            var tabRect = tabControl1.GetTabRect(i);
            tabRect.Inflate(-2, -2);
            var closeImage = Properties.Resources.Close;
            var imageRect = new Rectangle(
                (tabRect.Right - closeImage.Width),
                tabRect.Top + (tabRect.Height - closeImage.Height) / 2,
                closeImage.Width,
                closeImage.Height);
            if (imageRect.Contains(e.Location))
            {
                tabControl1.TabPages.RemoveAt(i);
                break;
            }
        }
    }
}

private void tabControl1_DrawItem(object sender, DrawItemEventArgs e)
{
    var tabPage = tabControl1.TabPages[e.Index];
    var tabRect = tabControl1.GetTabRect(e.Index);
    tabRect.Inflate(-2, -2);
    if (e.Index == tabControl1.TabCount - 1)
    {
        var addImage = Properties.Resources.Add;
        e.Graphics.DrawImage(addImage,
            tabRect.Left + (tabRect.Width - addImage.Width) / 2,
            tabRect.Top + (tabRect.Height - addImage.Height) / 2);
    }
    else
    {
        var closeImage = Properties.Resources.Close;
        e.Graphics.DrawImage(closeImage,
            (tabRect.Right - closeImage.Width),
            tabRect.Top + (tabRect.Height - closeImage.Height) / 2);
        TextRenderer.DrawText(e.Graphics, tabPage.Text, tabPage.Font,
            tabRect, tabPage.ForeColor, TextFormatFlags.Left);
    }
}