New Post: How to set a layer to the last-lowest layerposition on the map?

/// <summary>
        /// Inserts an element into the System.Collections.Generic.List&lt;T&gt; at the specified index.
        /// </summary>
        /// <param name="index">The zero-based index at which item should be inserted.</param>
        /// <param name="item">The object to insert. The value can be null for reference types.</param>
        /// <exception cref="System.ArgumentOutOfRangeException">index is less than 0.-or-index is greater than System.Collections.Generic.List&lt;T&gt;.Count.</exception>
        /// <exception cref="System.ApplicationException">Unable to insert while the ReadOnly property is set to true.</exception>
        public void Insert(int index, IMapLayer item)