[TYPO3-mvc] Backend module layout

[Kobbe van Daatselaar]

Hello list,
 
i'm currently programming an extbase extension with a backend module.
I've used the Blog example to see how this is done. The thing I'm
struggling with is the layout.
 
I want to use the same layout as the default Typo3 v4 backend. I copied
the HTML structure of a `normal` backend module but the default CSS is
not included. How can I include the default backend skin's css to my
extbase backend module?
 
Thanks in advance.
 
Kind regards,
Kobbe van Daatselaar
Zig Websoftware