Example of a network change?

Is there an example of a network change?

I have 2 Org networks againable to clients.  In my interface I want them to be able to take an existing VM and change the network by selecting from a drop down (not unline the VCD interface), and have it select new IP from the pool etc.

I have the URI of the network the user selected and was hoping it could be as simple as

$connection[0]->setNetworkConnection($newNetworkHref);

but alas this does not work

I have gone through the docs and am not sure exactly what way to go on this and continue to read.  If anyone can provide a few examples or direction of how this should be done I would really appreciate it as I expect a couple days of head banging as it seems with every function I have to implemnent with the API.

Thanks

Dion