can't find event handler in excel

I have a spreadsheet when you type a value in column a, a corresponding calculated field gets triggered in column b.

so... I type 5 in field a2 and 6 (=a2+1)appears in column b2.   The problem is that this spreadsheet was created 7 years ago, and I cant find or remember where the event handler code lives.  When I look in macros/vba no modules exist.  when I copy and paste both columns into a new worksheet/workbook the calculated field still works.  

If I click into fields a3 or b3 no data exists.  If I type a value in a3 and hit enter, the calculated field in b3 appears.  Can someone help me find the code or where the event trigger exists?
tike55Asked:
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FarWestCommented:
is it possible to give a sample that contains the case?
of course I assume that it is not a formula with auto calculation enabled :)
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Martin LissOlder than dirtCommented:
Is there a formula in B2? Is the code in the sheet's Worksheet_Change event or any other worksheet event?
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NorieVBA ExpertCommented:
Have you looked in the ThisWorkbook module?
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Saqib Husain, SyedEngineerCommented:
Try unchecking the option (for 2010)

File > Options > Advanced > Editing > Extend data range formats and formulas
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Wayne Taylor (webtubbs)Commented:
Is it possible that the worksheet is protected, with formula's hidden? Otherwise, to go directly to the worksheets code module which will contain the appropriate handler, right-click the worksheets tab and select "View Code".
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