How to put RehearsalMarks on their own horizontal line?

[Karol Majewski]

Hi,

I'm having a hard time trying put all RehearsalMarks on their own horizontal 
line. This is an example:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\version "2.19.10"

global = {
  \time 3/4 \tempo "Allegro" s1*3/4*2
}

part = {
  \clef treble
  c'4 \mark \default d'4 e'4
  c'4 \mark \default d'4 e'4
}

\score {
  \new Staff <<
    \global
    \part
  >>
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Here, I want "B" to be higher - on the same line as "A". In other words, I want 
rehearsalm marks to behave like expression marks in Dynamics context.

I tried to define new context, but with no success.

Any ideas appreciated.

--Best
Karol

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