code: function (childItems) {
          var length = childItems.length,
              index, childContext;
  
          for (index = 0; index < length; ++index) {
              childContext = childItems[index];
  
              childContext.setProp('x', childContext.layoutPos.x + childContext.marginInfo.left);
              childContext.setProp('y', childContext.layoutPos.y + childContext.marginInfo.top);
          }
      }
docs: Finishes by setting the positions on the child items.
  @private