src/org/tiefaces/components/websheet/utility/CellUtility.java
public static String getCellIndexLetterKey(final String columnLetter, final int rowIndex) {
		return TieConstants.CELL_ADDR_PRE_FIX + columnLetter + TieConstants.CELL_ADDR_PRE_FIX + rowIndex;
	}
public static String getCellIndexLetterKey(final String columnLetter, final int rowIndex) {
		return TieConstants.CELL_ADDR_PRE_FIX + columnLetter + TieConstants.CELL_ADDR_PRE_FIX + rowIndex;
	}
return cell index key with column letter and row index. e.g. $A$0 for A1
cell.

@param columnLetter
column letter.
@param rowIndex
row index.
@return String.