writer.writeClassAttribute(Classes.create(sheet, "headerCell"));
writer.startElement(HtmlElements.SPAN, null);
final Style headerStyle = new Style();
Measure headerHeight = Measure.valueOf(20).multiply(cell.getRowSpan());
if (!pure) {
headerHeight = headerHeight.subtract(6); // XXX todo
}
headerStyle.setHeight(headerHeight);
writer.writeStyleAttribute(headerStyle);
final AbstractUIColumn column = renderedColumnList.get(j);
String sorterImage = null;