Sounds like your trying to do an end device bind. Take a look at this tread we are talking about the same thing. Lutron Connected Bulb Remote
The devices should initiate the bind process with a button push or some type of local action. You don’t need a custom device type to bind together two ZigBee devices on the same network as long as they both support an end device initiated bind. The hub will do it for you as long as you start the bind request from each device. For example this ZigBee power plug http://smartenit.com/product/zbmplug15/ can be bound to this ZigBee switch http://smartenit.com/product/zbws3b/ just by pushing their program buttons. The hub will do this automatically its built into the ZigBee spec.
What are the two devices you are trying to bind together?