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        [ValidateNumberIsGreaterThan(
            ComparisonProperty = "Account.MinimumBalance",
            FailureMessage = "You can not withdraw anymore, you must maintain a minimum balance.",
            ValidationMessageType = typeof(ValidationWarningMessage),
            ValidateIfMemberValueIsValid = "Account.IsOpen")]

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    public sealed partial class FirstRunPage : VisualStateAwarePage
    {
        public FirstRunPage()
        {
            this.InitializeComponent();
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            //base.OnNavigatedTo(e);

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//-----------------------------------------------------------------------
// <copyright file="ParseRestHelper.cs" company="Sully Studios">
//     Copyright (c) Johnathon Sullinger. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace Lifestream.Data.Repository.ParseCloud
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

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    public class UserRepository : IUserRepository
    {
        /// <summary>
        /// Asks the data store to create a new user with the given data..
        /// </summary>
        /// <param name="data">The data that represents a user.</param>
        /// <param name="password">The password.</param>
        /// <returns>
        /// Returns a session token that can be used to preserve a user session.
        /// </returns>

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    public class UserService : IUserService
    {
        /// <summary>
        /// The cached user for re-use once fetched.
        /// </summary>
        private static User _cachedUser;

        /// <summary>
        /// The filename used when saving the users session token.
        /// </summary>

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        private async Task ExecuteSignin()
        {
            this.IsSigningIn = true;
            bool signinFailed = false;
            string failureMesage = string.Empty;

            try
            {
                User user = await this.userService.RetrieveUser(this.Username, this.Password);
                this.navigationService.Navigate("Main", user);

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        protected async override Task OnLaunchApplicationAsync(LaunchActivatedEventArgs args)
        {
            try
            {
                // Try to restore the user.
                IUserService userService = this.container.Resolve<IUserService>();
                User user = await userService.RetrieveUser();

                // If the user was restored, we can navigate to the main page.
                NavigationService.Navigate("Main", user);

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        protected override void OnHardwareButtonsBackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
        {
            var page = (Page)((Frame)Windows.UI.Xaml.Window.Current.Content).Content;
            if (page.GetType() == typeof(FirstRunPage))
            {
                var firstRunPage = (FirstRunPage)page;
                if (firstRunPage.CanGoBack())
                {
                    e.Handled = false;
                }

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        public override bool CanGoBack()
        {   
            return this.ViewModel.IsNewUser ? false : base.CanGoBack();
        }

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        protected override void OnHardwareButtonsBackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
        {
            var page = (Page)((Frame)Windows.UI.Xaml.Window.Current.Content).Content;
            if (page is INavigateBackwards)
            {
                var firstRunPage = (INavigateBackwards)page;
                if (!firstRunPage.CanNavigateBack())
                {
                    e.Handled = true;
                    return;