Page break in 2.4.0

[baenni]

Hi 

I use lilypond 2.4.0 and would like to insert a page break in a multi-part

score. I would like that a next part start on a new page. I found in the 
archive that 

\header{piece ="\\newpage part 2"}

should work. But in my case it does not work. Any ideas or suggestions to

solve the problem?

Dominik