public RegisterPageViewModel( INavigationService navigationService, IRegexHelper regexHelper, IApiService apiService, IFilesHelper filesHelper) : base(navigationService) { _navigationService = navigationService; _regexHelper = regexHelper; _apiService = apiService; _filesHelper = filesHelper; Title = Languages.Register; Image = App.Current.Resources["UrlNoImage"].ToString(); IsEnabled = true; User = new UserRequest(); Roles = new ObservableCollection <Role>(CombosHelper.GetRoles()); Campaigns = new ObservableCollection <Campaign>(CombosHelper.GetCampaigns()); }