context.getAttributes().put(Constants.HELPER_RENDERER, "columnGroup");
for(UIComponent child : group.getChildren()) {
if(child.isRendered()) {
if(child instanceof Row) {
Row footerRow = (Row) child;
writer.startElement("tr", null);
for(UIComponent footerRowChild : footerRow.getChildren()) {
if(footerRowChild.isRendered()) {
if(footerRowChild instanceof Column)
encodeColumnFooter(context, table, (Column) footerRowChild);
else
footerRowChild.encodeAll(context);