Slice/StoreServer/MainWindow.xaml.cs

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace StoreServer
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            ManagerFrame.MainFrame = this.MainFrame;
            ManagerFrame.MainFrame.Navigate(new StartWorkPage());
        }
            
            private void MainFrame_ContentRendered(object sender, EventArgs e)
        {
            BtnBack.Visibility = ManagerFrame.MainFrame.CanGoBack ? Visibility.Visible : Visibility.Collapsed;
        }

        private void BtnBack_Click(object sender, RoutedEventArgs e)
        {
            ManagerFrame.MainFrame.GoBack();
        }
    }
}