chore: adding dialog example to Uno sample

e2e/Uno/ModuleA/Dialogs/AlertDialog.xaml

@@ -0,0 +1,20 @@
+<UserControl
+    x:Class="ModuleA.Dialogs.AlertDialog"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:ModuleA"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    d:DesignHeight="300"
+    d:DesignWidth="400">
+
+  <StackPanel>
+    <TextBlock Text="{Binding Title}"
+               FontSize="20"
+               FontWeight="Bold" />
+    <TextBlock Text="{Binding Message}" />
+    <Button Content="OK"
+            Command="{Binding CloseCommand}" />
+  </StackPanel>
+</UserControl>

e2e/Uno/ModuleA/Dialogs/AlertDialog.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// The User Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234236
+
+namespace ModuleA.Dialogs
+{
+    public sealed partial class AlertDialog : UserControl
+    {
+        public AlertDialog()
+        {
+            this.InitializeComponent();
+        }
+    }
+}

e2e/Uno/ModuleA/Dialogs/AlertDialogViewModel.cs

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+namespace ModuleA.Dialogs;
+
+internal class AlertDialogViewModel : BindableBase, IDialogAware
+{
+    public AlertDialogViewModel()
+    {
+        CloseCommand = new DelegateCommand(() => RequestClose.Invoke(new DialogResult(ButtonResult.OK)));
+    }
+
+    private string _title = string.Empty;
+    public string Title
+    {
+        get => _title;
+        set => SetProperty(ref _title, value);
+    }
+
+    private string _message = string.Empty;
+    public string Message
+    {
+        get => _message;
+        set => SetProperty(ref _message, value);
+    }
+
+    public DelegateCommand CloseCommand { get; }
+
+    public DialogCloseListener RequestClose { get; }
+
+    public bool CanCloseDialog() => true;
+
+    public void OnDialogClosed()
+    {
+
+    }
+
+    public void OnDialogOpened(IDialogParameters parameters)
+    {
+        Title = parameters.GetValue<string>("title");
+        Message = parameters.GetValue<string>("message");
+    }
+}

e2e/Uno/ModuleA/ViewModels/ViewAViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ModuleA.ViewModels;
+
+internal class ViewAViewModel : ViewModelBase
+{
+    public ViewAViewModel(IRegionManager regionManager)
+        : base(regionManager)
+    {
+    }
+}

e2e/Uno/ModuleA/ViewModels/ViewBViewModel.cs

@@ -0,0 +1,9 @@
+namespace ModuleA.ViewModels;
+
+internal class ViewBViewModel : ViewModelBase
+{
+    public ViewBViewModel(IRegionManager regionManager)
+        : base(regionManager)
+    {
+    }
+}

e2e/Uno/ModuleA/ViewModels/ViewModelBase.cs

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+using System.Collections.ObjectModel;
+
+namespace ModuleA.ViewModels;
+
+internal class ViewModelBase : BindableBase, IRegionAware
+{
+    private readonly string _name;
+    protected IRegionManager RegionManager { get; }
+
+    protected ViewModelBase(IRegionManager regionManager)
+    {
+        RegionManager = regionManager;
+        Title = _name = GetType().Name.Replace("ViewModel", string.Empty);
+    }
+
+    private string _title = string.Empty;
+    public string Title
+    {
+        get => _title;
+        set => SetProperty(ref _title, value);
+    }
+
+    private ObservableCollection<string> _messages = new();
+    public IEnumerable<string> Messages => _messages;
+
+
+    public bool IsNavigationTarget(NavigationContext navigationContext) =>
+        navigationContext.NavigatedName() == _name;
+
+    public void OnNavigatedFrom(NavigationContext navigationContext)
+    {
+        _messages.Add("OnNavigatedFrom");
+    }
+
+    public void OnNavigatedTo(NavigationContext navigationContext)
+    {
+        if (navigationContext.Parameters.TryGetValue("title", out string title))
+        {
+            Title = title;
+        }
+
+        _messages.Add("OnNavigatedTo");
+    }
+}