from as2 to as3

Yah very important point from NetDragon. As of version 3.0 the netconnection " class was dynamic in ActionScript 2.0 but is now sealed. " so you can't just do something like:

netconnection.client.somefunction = function() {...}

The default netconnection.client = this, so you need to extend it with a custom class or an object to be able to add callback functions

But be careful, I wrote an entire app that worked with the AS2.0 technique ...without an error from the compiler.....(flex 2.0).

the NetConnection has a property called client, this property in an object of set of function that you can call from the server
check this code:

var clientCallBacks:Object = new Object();
clientCallBacks.setUserNameAndServerId = onSetUserNameAndServerId;
connection.client = clientCallBacks;

now I can call "setUserNameAndServerId" from the server and at client the function "onSetUserNameAndServerId" will be run.

I hope that help ...

you using ...call(); or send(); ??