Unexpected SelectionChange event code

Hello,
time-to-time an unexpected eventcode appears in my worksheet modules

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This leads to "macro confirmation dialog" on start of that worksheet.

I know I can prevent from that dialog by deleting those events from all modules, but how can I avoid their very creating? When could they have appeared?

Thanks a lot!

Probably, I did not.
This usually starts like this:

1) I get the "macro confirming dialog" in worksheet opened.
2) I open the VB editor and go throug the sheet's source codes. In most of them (if not all) there is that empty event code.
3) I delete them from each sheet.
4) I'm confused.

These workbooks are used by my colleagues too, but I doubt they doubleclick on anything in VB editor.

BTW, I'm not sure what colud I doubleclick on in the Properties Window. You meen the name of the sheet in the dropdown menu? I don't see any results of that in related source code.

Thank you for helping.

PS: In my first post I probably misused the "module" term. I meant the sheet source code - You probably know...

Maybe I'm missing something simple, but I can't reconstruct your example.
1) I create a new workbook (Book6.xls).
2) I open VB editor.
3) I doble click the sheet1 module (Project explorer/VBAproject(Book6.xls)/Microsoft Excel Objects/Sheet1(Sheet1)
4) I don't see any proceudre inserted.
5) I save, close and reopen the workbook.
6) Still don't see any unexpected codes nor am I getting any macro dialog.
Is that what you meant?
Many thanks.

Nothing happens.
There is only one option in the drop down menu:

"Sheet1 Worksheet"

After clicking the menu this option is offered to be selected. I select it and nothing visible hapens. No source generated.

But even if it was, is this the only way, how the code can appear? I'd expected something less sophisticated, like unintentional adding (and removing) some control. But not explicit adding those object, we don't use them.

I see, this worked!
But I can not imagine, how could this happen unintentionally on more sheets in the workbook as I wasn't able to do it trying to.

I agree,
somebody has to do something. It's just weird. I thought, this could be a known problem. Locking the vb project for viewing is a good idea.
Roy, Andy, thank you a lot.
Bristly