private class OwnerDrawListBox : ListBox
        {

            private void Add(Control item)
            {
                this.Items.Add(item);
                var topIndent = this.Owner.TopIndex * this.ItemHeight;
                this.Controls.Add(item);
                var rect = this.GetItemRectangle(this.Items.Count - 1);
                item.Location = rect.Location;
                item.Left += 20;
                item.Width = 100;
            }

            protected override void OnDrawItem(DrawItemEventArgs e)
            {
                using (Graphics g = e.Graphics)
                {
                    Brush myBrush = Brushes.Black;
                    if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
                        e.Graphics.FillRectangle(new SolidBrush(System.Drawing.SystemColors.MenuHighlight), e.Bounds);
                    else
                        e.Graphics.FillRectangle(new SolidBrush(this.BackColor), e.Bounds);
                    e.Graphics.DrawString(this.GetItemText(this.Items[e.Index]), e.Font, myBrush, e.Bounds.X, e.Bounds.Y);
                    e.DrawFocusRectangle();
                }
            }
        }        

listBoxEx1.ItemHeight = 50;
            listBox1Ex.DisplayMember = "Text";
            for (var i = 0; i < 10; i++)
            {
                listBoxEx1.Add(new Button { Text = i.ToString() });
            }