Record order changes by performing sort on multiple columns consecutively.

On this example http://live.datatables.net/

1. Sort on name in descending order and then on office in descending order : 1st record is Zorita Serrano
2. Sort on salary in descending order and then on office in descending order : 1st record is Gavin Cortez and 2nd is Zorita Serrano.

I have a use case when I want to have Zorita Serrano as 1st record when I sort on office column, no matter how many sorts I do previously.

What the option/implementation to have consistent grouping / ordering of records?

Thanks
Ankur Dohare