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.