Whenever I use the RFID Manager, I can add a device without specifying a parent group. I'm trying to do the same thing programmatically using the DeviceManagerProxy's AddDevice method, but I can't get it to work without specifying a parent group. If I pass a null or an empty string ("") for the group, I get the following logged error: "Failed during AddDevice(). Error = Cannot complete the operation on the device or device group as the specified name is either null or empty. Specify a valid name, and then retry the operation."

What do I pass to AddDevice if the parent group isn't wanted?

Thanks.