public ICustomRuntimeRegistrationToken Register(ICustomRuntime customRuntime)
        {
            CustomRuntimeRegistration registration = new CustomRuntimeRegistration(this, customRuntime);

            _activeRegistrations[registration] = null;
            return(registration);
        }
 public ICustomRuntimeRegistrationToken Register(ICustomRuntime customRuntime) {
     CustomRuntimeRegistration registration = new CustomRuntimeRegistration(this, customRuntime);
     _activeRegistrations[registration] = null;
     return registration;
 }