Need to allow only one of 2 buttons in a region to respond when enter pressed

Hi,
Apex version 4.2
Theme: Blue Resposive 25
My page has 1 region with a sub-region inside it. Both regions have a button. When I hit enter it seems the button in the sub-region is the one that gets actioned. I don't want this to happen I want the other button to run. Is this possible ?
Also when I google around looking for answers to this issue I see references to apex page items having a setting value of 'Submit when enter pressed' which can be changed to Yes or No. I simply can't find that setting in my items. Perhaps it has been removed in apex 4.2 ?
Thanks
Steve.

Daggers wrote:
Thanks Scott,
That is useful information. I turned on debug and I can see that my problem is actually that neither button is being submitted on enter.
Are you able to tell me where the setting 'Submit when enter pressed' ? is found. I think this is probably the key to my issue.
Steve.
It's in the item's Settings section. However, it's only available on Text and Password items.

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