protected static HSSFComment findCellComment(Sheet sheet, int row, int column){
// TODO - optimise this code by searching backwards, find NoteRecord first, quit if not found. Find one TXO by id
HSSFComment comment = null;
HashMap<Integer, TextObjectRecord> txshapesByShapeId = new HashMap<Integer, TextObjectRecord>();
for (Iterator<RecordBase> it = sheet.getRecords().iterator(); it.hasNext(); ) {
RecordBase rec = it.next();
if (rec instanceof NoteRecord){
NoteRecord note = (NoteRecord)rec;
if (note.getRow() == row && note.getColumn() == column){
TextObjectRecord txo = txshapesByShapeId.get(new Integer(note.getShapeId()));
comment = new HSSFComment(note, txo);