ArcGISRuntime.Samples.Desktop.Configuration.PageGroup.this C# (CSharp) Метод

        public PageElement this[int index]
        {
            get { return (PageElement)BaseGet(index); }
            set
            {
                if (BaseGet(index) != null)
                {
                    BaseRemoveAt(index);
                }
                BaseAdd(index, value);
            }
        }