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

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