Agent VMs and maintenance mode

I`ve just deployed fresh vShere 5.1 with Trend Micro Deep Security antivirus solution. My problem is that when i want to put host into mainenance mode, the process gets stuck because Trend Micro VM is pinned to specific host and it is unable to migrate. I have to manually shut down the VM.

Now, I`ve read that there is something called "Agent VM" and when VM is marked as agent VM, it goes down automaticly when host is going into maitenance mode.

So the question is - how can i tag VM as an Agent VM?