Button to save group / replace group without confirmation

I find I'm saving / resaving groups a lot.

I'd like to make a button that will save the group in the lister, and will replace an existing group without confirmation.
I'm hoping I could get a clue about how to create such a button.

You can make buttons which save over specific tab groups, without confirmation:

Go TABGROUPSAVE "test"

There is no way to make them automatically save over the 'current' tab group, though. Opus doesn't remember the last tab group you loaded, and there are several ways of opening tabs that wouldn't automatically tie them to any tab group.

Thanks for quick reply.
Drat re "no way to make them automatically save over the 'current' tab group."