set remoting gateway with AMF3

Hello, i began since few weeks to use pyamf. I made an application using a channel and configured pylons with pyamf.remoting.gateway.wsgi (i toke the pyamf example for both).

Everything works but i have no idea where or how to set my application to use AMF3. (to be sure that is AMF3 which is used and not AMF0 when i remote my object).

hope you will understand me and thanks for the answer.