[racket] Reordering tabs in DrRacket

Hi,

Is there a method somewhere to reorder tabs in DrRacket, like a
`change-children' method?
I see a `get-tabs' method, but not a `set-tabs' one:
http://docs.racket-lang.org/tools/drracket_unit.html?q=get-tabs#%28meth._%28%28%28lib._drracket%2Ftool-lib..rkt%29._drracket~3aunit~3aframe~3c~25~3e%29._get-tabs%29%29

Thanks,
Laurent
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