Add project files.

ViewModels/Pages/DashboardViewModel.cs

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+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+namespace DownloadManager.ViewModels.Pages;
+
+public partial class DashboardViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private int _counter = 0;
+
+    [RelayCommand]
+    private void OnCounterIncrement()
+    {
+        Counter++;
+    }
+}

ViewModels/Pages/DataViewModel.cs

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+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System.Windows.Media;
+using DownloadManager.Models;
+using Wpf.Ui.Controls;
+
+namespace DownloadManager.ViewModels.Pages;
+public partial class DataViewModel : ObservableObject, INavigationAware
+{
+    private bool _isInitialized = false;
+
+    [ObservableProperty]
+    private IEnumerable<DataColor> _colors;
+
+    public void OnNavigatedTo()
+    {
+        if (!_isInitialized)
+            InitializeViewModel();
+    }
+
+    public void OnNavigatedFrom()
+    {
+    }
+
+    private void InitializeViewModel()
+    {
+        var random = new Random();
+        var colorCollection = new List<DataColor>();
+
+        for (int i = 0; i < 8192; i++)
+            colorCollection.Add(
+                new DataColor
+                {
+                    Color = new SolidColorBrush(
+                        Color.FromArgb(
+                            (byte)200,
+                            (byte)random.Next(0, 250),
+                            (byte)random.Next(0, 250),
+                            (byte)random.Next(0, 250)
+                        )
+                    )
+                }
+            );
+
+        Colors = colorCollection;
+
+        _isInitialized = true;
+    }
+}

ViewModels/Pages/SettingsViewModel.cs

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+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using Wpf.Ui.Appearance;
+using Wpf.Ui.Controls;
+
+namespace DownloadManager.ViewModels.Pages;
+public partial class SettingsViewModel : ObservableObject, INavigationAware
+{
+    private bool _isInitialized = false;
+
+    [ObservableProperty]
+    private string _appVersion = String.Empty;
+
+    [ObservableProperty]
+    private ApplicationTheme _currentTheme = ApplicationTheme.Unknown;
+
+    public void OnNavigatedTo()
+    {
+        if (!_isInitialized)
+            InitializeViewModel();
+    }
+
+    public void OnNavigatedFrom()
+    {
+    }
+
+    private void InitializeViewModel()
+    {
+        CurrentTheme = ApplicationThemeManager.GetAppTheme();
+        AppVersion = $"UiDesktopApp1 - {GetAssemblyVersion()}";
+
+        _isInitialized = true;
+    }
+
+    private string GetAssemblyVersion()
+    {
+        return System.Reflection.Assembly.GetExecutingAssembly().GetName().Version?.ToString()
+            ?? String.Empty;
+    }
+
+    [RelayCommand]
+    private void OnChangeTheme(string parameter)
+    {
+        switch (parameter)
+        {
+            case "theme_light":
+                if (CurrentTheme == ApplicationTheme.Light)
+                    break;
+
+                ApplicationThemeManager.Apply(ApplicationTheme.Light);
+                CurrentTheme = ApplicationTheme.Light;
+
+                break;
+
+            default:
+                if (CurrentTheme == ApplicationTheme.Dark)
+                    break;
+
+                ApplicationThemeManager.Apply(ApplicationTheme.Dark);
+                CurrentTheme = ApplicationTheme.Dark;
+
+                break;
+        }
+    }
+}

ViewModels/Windows/MainWindowViewModel.cs

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+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System.Collections.ObjectModel;
+using Wpf.Ui.Controls;
+
+namespace DownloadManager.ViewModels.Windows;
+public partial class MainWindowViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private string _applicationTitle = "WPF UI - Downloader";
+
+    [ObservableProperty]
+    private ObservableCollection<object> _menuItems = new()
+    {
+        new NavigationViewItem()
+        {
+            Content = "Home",
+            Icon = new SymbolIcon { Symbol = SymbolRegular.Home24 },
+            TargetPageType = typeof(Views.Pages.DashboardPage)
+        },
+        new NavigationViewItem()
+        {
+            Content = "Data",
+            Icon = new SymbolIcon { Symbol = SymbolRegular.DataHistogram24 },
+            TargetPageType = typeof(Views.Pages.DataPage)
+        }
+    };
+
+    [ObservableProperty]
+    private ObservableCollection<object> _footerMenuItems = new()
+    {
+        new NavigationViewItem()
+        {
+            Content = "Settings",
+            Icon = new SymbolIcon { Symbol = SymbolRegular.Settings24 },
+            TargetPageType = typeof(Views.Pages.SettingsPage)
+        }
+    };
+
+    [ObservableProperty]
+    private ObservableCollection<MenuItem> _trayMenuItems = new()
+    {
+        new MenuItem { Header = "Home", Tag = "tray_home" }
+    };
+}