Find ties enclosed in slur (while overriding stencil)

[Urs Liska]

Hi,

I'm trying to determine if a slur includes ties in order to do some
layout calculations.

I'm overriding a stencil and have retrieved the slur's 'note-columns.
Now I want to know if any of these note-columns (or enclosed note heads
has a tie attached to it.

I see that NoteColumn has a note-heads property. However, accessing
these note heads and then asking for their ly:grob-object  NAME 'ties
returns empty lists only.

So what is the proper way to assess all the note columns within a slur
and retrieve any included ties?
The information I actually need is the note head's staff position and
the tie's direction.

Any suggestions?
Urs

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