Using a slur-shaped tuplet "bracket"

[Reinhold Kainhofer]

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Is there any way to print the tuplet bracket similar to a slur? 

I tried simply setting the TupletBracket's stencil property to the slur 
stencil, but that resulted in a slur with wrong control points. 
Unfortunately, it seems that one can also not use the slur's 
calc-control-points function, as that gives me an error...

A sample file is attached.
Do you know how this can be solved?

Cheers,
Reinhold
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Reinhold Kainhofer, Vienna University of Technology, Austria
email: address@hidden, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/
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