a question about menuitem

See more:

C#

.NET

WinForms

public class CustomMenuItem : ToolStripMenuItem
{
        protected override void OnPaint(PaintEventArgs e)
        {
            var rect = new RectangleF(1, 1, this.Size.Width-2, this.Size.Height-2);
            if (IsMouseHover == true)
            {
                using (var b = new SolidBrush(Color.FromArgb(49, 106, 197)))
                {
                    e.Graphics.FillRectangle(b, rect);
                }
            }
            else
            {
                using (var b = new SolidBrush(Color.FromArgb(255, 255, 255)))
                {
                    e.Graphics.FillRectangle(b, rect);
                }
            }

            CheckState state = this.CheckState;
            if (state == System.Windows.Forms.CheckState.Checked)
            {
                if ((CheckMarkDisplayStyle == CheckMarkDisplayStyle.RadioButton))
                {
                    DrawCircle(e.Graphics);
                }
                else if ((CheckMarkDisplayStyle == CheckMarkDisplayStyle.CheckBox))
                {
                    DrawChecked(e.Graphics);
                }

                this.Checked = true;

                finalCheckedMenuItem = this;
            }

            SolidBrush drawBrush = new SolidBrush(Color.Black);
            System.Drawing.Size txtSize = TextRenderer.MeasureText(this.Text, this.Font);

            PointF drawPoint = new PointF(10, (this.Height - txtSize.Height) / 2);

            StringFormat sf = new StringFormat();
            //sf.Alignment = StringAlignment.Center;
            //sf.LineAlignment = StringAlignment.Center;
            sf.HotkeyPrefix = this.ShowKeyboardCues ? HotkeyPrefix.Show : HotkeyPrefix.Hide;  
            e.Graphics.DrawString(this.Text.ToString(), this.Font, drawBrush, drawPoint,sf);
        }
}

when i inheritance ToolStripMenuItem,and beacause of some reasons,i don't written base.OnPaint(e); my require is set the shortcutkeys and show nomal in toolstripmenuitem.text ,but now it invalid. how can i solove this question?

improve my question:
Shortcutkeys property is invalid,and not show in the toolstripmenuitem.Text.