int sheetIndex = getWorkbook().getSheetIndex(this);
String sheetName = getWorkbook().getSheetName(sheetIndex);
FormulaShifter shifter = FormulaShifter.createForRowShift(
sheetIndex, sheetName, startRow, endRow, n);
rowShifter.updateNamedRanges(shifter);
rowShifter.updateFormulas(shifter);
rowShifter.shiftMerged(startRow, endRow, n);
rowShifter.updateConditionalFormatting(shifter);
//rebuild the _rows map