static/ext/src/layout/container/Border.js
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);
        }
    }
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);
        }
    }
Finishes by setting the positions on the child items.
@private