namespace System.ComponentModel.Design
{
    public abstract class DesignerOptionService : IDesignerOptionService
    {
        [DefaultMember("Item")]
        [Editor("", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
        [TypeConverter(typeof(DesignerOptionConverter))]
        public sealed class DesignerOptionCollection : ICollection, IEnumerable, IList
        {
            public int IndexOf(DesignerOptionCollection! value);
        }
    }
}