Customizing ddoc from cmd-line

[Peter Sommerfeld]

I seem to be unable to customize DDoc from the
command line.

Suppose the sources are in "src", docs in "doc".
Here is my command line (Win7 if that matters):

     dmd -D -Dddoc doc/my.ddoc src/main.d

Nothing happens...

What I would like to do is to add a style sheet
as described in http://dlang.org/ddoc.html.
Isn't it not possible from the cmdline or do
I something wrong here ? How to make it working ?

Peter