NetStatusEvent doesnt fire some of the events

programming flash
1

if I say:
netStream.pause();
netStream.resume();
netStream.togglePause();
netStream.close();

these events dont seem to be fired…

_netStream.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
        
private function onNetStatus(evt:NetStatusEvent):void
{
    trace("netStream_onNetStatus: " + evt.info.code, evt.target);
    switch(evt.info.code)
    {
        case "NetConnection.Connect.Closed":
            //do something
            break;
        case "NetStream.Pause.Notify":
            //do something
            break;
        case "NetStream.Unpause.Notify":
            //do something
            break;
    }      
}

not that I especially need those but how can I rely on netStreamEvents if I dont know which is or isnt going to be fired…