Async with callback doesn't work

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I'm trying to use protobufremote asynchronously, everything is working properly 
with synchronous method but when using it with a callback which is supposed to 
get the resultset back there's no way to obtain it.
When debugging, it seems that the ProtoFromMessage is never called ( i'm doing 
my test on a user object )

Basically scheme is the following

AsyncCallback cb = new AsyncallBack ( ProcessResult );

IAsyncResult res = BeginGetData(object myparam,cb,null);
...

void ProcessResult ( IAsyncResult res)
{
 if (res.Completed)
 {
    MyObject obj = (MyObject) res.Result; // here impossible because IAsynResult is a PendingCall object so => res.Result is a ProtoParam => so it should have been serialized before in the process i assume

How can i do it.....?
  }
}

Original issue reported on code.google.com by philippe...@gmail.com on 27 Sep 2012 at 12:19