Shutdown VM from VRA with VCO Workflow

Hi,

I'm a beginner at VCO and I need some help with basic Workflow.

I tried to create a new WF -  receive a vCAC:VirtualMachine for a user and then Shutdown the machine.

For starters, I created WF and added scriptable task that print Input System.log(vCAC:VirtualMachine);

and now I don't know how to continue... In VCO doesn't has  action to Shutdown vCAC:VirtualMachine .

Thanks.