List in Property

    public List<ColumnValueList> _ColumnValueList = new List<ColumnValueList>();

    [ReadOnly(true)]
    [TypeConverter(typeof(ExpandableObjectConverter))]
    [Category("Lista")]
    public class ColumnValueList
    {
        private string _Title = "";

        /// <summary>
        /// Gets or sets the last name of the person.
        /// </summary>
        /// <value>The last name of the person.</value>
        [DefaultValue(null)]
        [Category("Valores")]
        [Description("IndicatesValores.")]
        [DisplayName("Column")]
        [ReadOnly(true)]
        [NotifyParentProperty(true)]
        public string Title
        {
            get
            {
                return this._Title;
            }
            set
            {
                if (value != this._Title)
                    this._Title = value;
            }
        }

        public override string ToString()
        {
            return (this._Title);
        }
    }

private void OnPropertyGridPropertyChildAdding(object sender, PropertyDataAccessorChildAddingRoutedEventArgs e) {

        }