public void Execute(object parameter) { var faculty = _dataProvider.GetFacultyByUniversityAndGroupId(_university.Id, _group.Id); if (faculty == null) { return; } _flurryPublisher.PublishContextMenuShowGroupTimeTable(_university, _group.GroupName, _group.Id); var navigationParameter = new LessonsNavigationParameter { Id = _group.Id, IsTeacher = false, FacultyId = faculty.Id, UniversityId = _university.Id }; _navigationService.NavigateTo <LessonsPageViewModel, LessonsNavigationParameter>(navigationParameter); }