Tie shape

[Pieter Terpstra]

Dear people,
Another question.
Trying to change the shape of the tie in such a way that the c note becomes 
free from the tie overlap.
The \Shape command works on the lowest tie but not on the next?
To add the \Shape command a second time makes no difference.

Here is the example:
\score {
  \relative c' {
    g'16\rest 
  \shape #'((0 . 0) (0 . -1) (0 . -1) (0 . 0)) Tie
  \set tieWaitForNote = ##t
  b,~
  \shape #'((-3 . 0) (0 . -3) (0 . -3) (0 . 0)) Tie
  d~ g~ s8 c ~ s4 <b, d g c>
  }
}

Kindly,

   Peter