public void UpdateFormulasAfterCellShift(FormulaShifter shifter, int externSheetIndex)
{
for (int i = 0; i < _cfHeaders.Count; i++)
{
CFRecordsAggregate subAgg = (CFRecordsAggregate)_cfHeaders[i];
bool shouldKeep = subAgg.UpdateFormulasAfterCellShift(shifter, externSheetIndex);
if (!shouldKeep)
{
_cfHeaders.RemoveAt(i);
i--;
}
}
}
