How to prevent page break before Part and Chapter

[Daniel Lohmann]

Hi LyX-Folks,

This most probably is, as 90% of the messages on this list, more realated 
to LaTeX than to LyX itself:

For my thesis I am using the koma-script book class (scrbook). I would like 
to remove (suppress) the usual page breaks before Part and Chapter headings 
in draft printings,  but print a horizontal line instead.

As there is no option for this in LyX, I guess I have to redefine the \part 
and \chapter commands somehow :-) But how?


Daniel