/// <summary>
 /// Default ctor
 /// </summary>
 protected RailwayItem(IRailway railway, ItemContext context)
 {
     this.railway  = railway;
     this.context  = context;
     LayoutManager = new PositionedEntityLayoutManager();
 }
 /// <summary>
 /// Default ctor
 /// </summary>
 public PositionedItemContainer()
 {
     LayoutManager = new PositionedEntityLayoutManager();
 }