public AccountBalanceSummaryViewModel(IEthWalletService walletService,
                                       IAccountTokenViewModelMapperService accountTokenViewModelMapperService
                                       )
 {
     this.walletService = walletService;
     this.accountTokenViewModelMapperService = accountTokenViewModelMapperService;
     tokenBalanceSummary = new ObservableCollection <AccountTokenViewModel>();
     Title = "Account Balance";
     Icon  = "blog.png";
 }