protected BaseStock(BaseStock copy) : base(copy)
        {
            _name = copy.Name;
            _deltaX = copy.DeltaX;
            _deltaY = copy.DeltaY;
            _deltaZ = copy.DeltaZ;
            _selectedOffset = copy.SelectedOffset;
        }

        public override IMergeable Merge(IMergeable mergeable)
        {
            var item = mergeable as BaseStock;
            if (item == null) return this;
            Name = item.Name;
            DeltaX = item.DeltaX;
            DeltaY = item.DeltaY;
            DeltaZ = item.DeltaZ;
            SelectedOffset = item.SelectedOffset;
            return this;
        }