Prevent Change in Event when not needed

[JK]

I have a combo box "A" in a worksheet which (upon change) is supposed
to initialize combo boxes "B" & "C". It works fine. If I select a
value in "A" and then select values in "B" & "C" (other than default)
and suppose I want to save this file with a new name.

For some reason, upon "SAVE AS" the combo boxes "B" and "C" initialize
to my default values. How can I prevent triggering event "A" during
"SAVE AS" event?

Any help will be greatly appreciated.

Thanks.