src/org/tiefaces/components/websheet/utility/CellUtility.java
public static String getCellIndexNumberKey(final Cell cell) {
		if (cell != null) {
			return TieConstants.CELL_ADDR_PRE_FIX + cell.getColumnIndex() + TieConstants.CELL_ADDR_PRE_FIX
					+ cell.getRowIndex();
		}
		return null;
	}
public static String getCellIndexNumberKey(final Cell cell) {
		if (cell != null) {
			return TieConstants.CELL_ADDR_PRE_FIX + cell.getColumnIndex() + TieConstants.CELL_ADDR_PRE_FIX
					+ cell.getRowIndex();
		}
		return null;
	}
return cell index number key. e.g. $0$0 for A1 cell.

@param cell
input cell.
@return string.