Implementation of Row Exchange Button in Calc

Dear OpenOffice Dev List
I'm new in the list and I'm looking forward to nice discussions.

I was thinking, would it be possible to implement some kind of row-row 
exchange button in Calc? Of course, the same could apply to 
column-column exchange.

Anyway, would be cool if someone could point me out to some part of the 
code where one might start looking at this.

Thanks for hints.
Martin
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