if (column instanceof UIColumnSelector) {
renderColumnSelectorHeader(facesContext, writer, sheet);
} else {
RenderUtils.encode(facesContext, cellComponent);
final AbstractUIMenu dropDownMenu = FacetUtils.getDropDownMenu(column);
// render sub menu popup button
if (dropDownMenu != null && dropDownMenu.isRendered()) {
writer.startElement(HtmlElements.SPAN, column);
writer.writeClassAttribute(Classes.create(column, "menu"));
writer.startElement(HtmlElements.IMG, column);