/// <summary>
 /// Insert some layers to the top of destination layerage.
 /// </summary>
 /// <param name="destination"> The destination layerage. </param>
 /// <param name="sources"> The source layers. </param>
 /// <param name="isBottomInsert"> Insert to the top or bottom. </param>
 public static void InsertRange(Layerage destination, IEnumerable <Layerage> sources, bool isBottomInsert) => LayerManager.InsertCore(destination, null, sources, isBottomInsert);
 /// <summary>
 /// Insert a layerage to the top of destination layerage.
 /// </summary>
 /// <param name="destination"> The destination layerage. </param>
 /// <param name="source"> The source layerage. </param>
 /// <param name="isBottomInsert"> Insert to the top or bottom. </param>
 public static void Insert(Layerage destination, Layerage source, bool isBottomInsert) => LayerManager.InsertCore(destination, source, null, isBottomInsert);