Multisite, one total sitemap

I have a MU.
Pagelist works perfect on the different sites. But is it possible to have all the sitemaps on the portal together?
The portal is http://www.gielvandam.nl
The four sites are: http://www.theaterbureauspot.nl; http://www.circus-bedrijfsuitje.nl; http://www.circus-schoolreisje.nl; http://www.gielvandam.nl/theater-acts/
On the sitemap of the portal, you don’t see ALL the pages of the network.

http://ww.wp.xz.cn/extend/plugins/page-list/