Right click on the sheet tad where you want this to happen and select
View Code. Then paste in the code below. Modify the message box as
needed.
Private Sub Worksheet_Activate()
MsgBox "your stuff here!"
End Sub
Thanks. It works great.
I was trying to use Workbook_SheetChange, but then I got the message for all
sheets, and I didn't know how to isolate the single sheet.