public DesignTimeAccountListViewModel()
        {
            AllAccounts = new ObservableCollection <Account> {
                new Account {
                    Name           = "Sparkonto",
                    CurrentBalance = 1256.25,
                    Iban           = "CH12 12356 FX12 5123"
                }
            };

            BalanceViewModel = new DesignTimeBalanceViewModel();
        }
        public DesignTimeAccountListViewModel()
        {
            AllAccounts = new ObservableCollection<Account>
            {
                new Account
                {
                    Name = "Sparkonto",
                    CurrentBalance = 1256.25,
                    Iban = "CH12 12356 FX12 5123"
                }
            };

            BalanceViewModel = new DesignTimeBalanceViewModel();
        }