namespace System.Windows.Forms
{
    [LookupBindingProperties]
    public class CheckedListBox : ListBox
    {
        [DefaultMember("Item")]
        public class CheckedIndexCollection : ICollection, IEnumerable, IList
        {
            [Browsable(false)]
            [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
            public int this[int index] { get; }
        }
    }
}