private Element getByClassName(final Element parent, final String className) {
        final NodeList<Element> nodes = parent.getElementsByTagName("div");
        for (int i = 0; i < nodes.getLength(); i++) {
            final Element child = nodes.getItem(i);
            if (ElementUtil.hasClassName(child, className)) {
                return child;
            }
        }
        return null;
    }
The currently focused value key. Only one key can be focused at any time.
stroom-core-client-widget/src/main/java/stroom/cell/valuespinner/client/ValueSpinnerCell.java