public override string GetStackTitle(PersistentEvent ev) {
            if (!ShouldHandle(ev))
                return null;

            if (ev.IsSessionHeartbeat())
                return "Session Heartbeat";

            return ev.IsSessionStart() ? "Session Start" : "Session End";
        }
 private bool ShouldHandle(PersistentEvent ev)
 {
     return ev.IsSessionStart() || ev.IsSessionEnd() || ev.IsSessionHeartbeat();
 }