Stream.prototype.onStatus problem

Yes, as Casey_ noted you must get the stream reference and set the handler directly. Stream objects are native objects, which means they are not created the same way as script objects, and they do not have prototypes.

In order for you to recieve an event for any stream on the server you must be listening to that stream.

Try this on your server along with your prototype and you should get the stream events:
application.onAppStart = function()
{
trace("onAppStart");
application.testStream = Stream.get("WhoCaresWhatIAmNamedAsLongAsIDoNotConflictWithARealStreamName");
application.testStream.onStatus = function(info)
{
var level = info.level;
var code = info.code;
var description = info.description;
var details = info.details;
trace("onStatus(level='"+ level +"', code='"+ code +"', description='"+ description +"', details='"+ details +")");
if (code == "NetStream.Play.UnpublishNotify")
{
trace("Do Your Magic")
}
};
application.testStream.play("TestStream");
}