A RenderOrderAction indicating to render the item with the given name.
Inheritance: AbstractRenderOrderAction
        /// <summary>
        /// Handle a RenderItem action in the RenderOrder.
        /// </summary>
        /// <param name="action"></param>
        private void HandleRenderOrderAction_RenderItem(
            RenderOrder.RenderItem action, RenderableHandler renderAction)
        {
            var renderable = AllRenderables.GetItem(action.Name);

            if (!(action.SkipDuplicates && SeenRenderables.Contains(renderable)))
            {
                renderAction(renderable);
            }
        }