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.