src/org/tiefaces/components/websheet/utility/CellUtility.java
public static String getCellIndexNumberKey(final int columnIndex, final int rowIndex) {
		return TieConstants.CELL_ADDR_PRE_FIX + columnIndex + TieConstants.CELL_ADDR_PRE_FIX + rowIndex;
	}
public static String getCellIndexNumberKey(final int columnIndex, final int rowIndex) {
		return TieConstants.CELL_ADDR_PRE_FIX + columnIndex + TieConstants.CELL_ADDR_PRE_FIX + rowIndex;
	}
return cell index number key. e.g. $0$0 for A1 cell.

@param columnIndex
column index.
@param rowIndex
row index.
@return string.