Vista - How to crash dump a Guest running Windows 2008

Hi,

I am trying to crash dump a gues OS (Windows 2008 Ent) running in a VM on Hyper-V (RTM)

someone suggested "DUMPVM -s <machine name> -v "Virtual Machine Name"", however that is not working.
(it probably requires SCVMM to be installed, which I do not have)

so, my question is how can I force a crash-dump on Windows 2008 running in a VM on Hyper-V

roughly something like this : http://support.microsoft.com/kb/928839
but then on Hyper-V

thanks
Edwin.