Rubric set text without undorecord

> Anyone knows how to set the text in a rub text model without
> generating an undorecord?
>
> Right now, opening a message browser and scrolling through the lists
> of entries
> updates the text on the code pane and every update will create a new
> undorecord.
> I would prefer if the undorecord is only generated when *editing* a
> method.
>
> nicolai