Add project files.

Hyperbar.Desktop/Templates/TemplateFactory.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Hyperbar.Desktop;
+
+public class TemplateFactory(ITemplateGeneratorFactory factory,
+    IEnumerable<IDataTemplateDescriptor> descriptors,
+    IServiceProvider provider) :
+    DataTemplateSelector,
+    ITemplateFactory
+{
+    protected override DataTemplate SelectTemplateCore(object item) => factory.Create();
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container) => factory.Create();
+
+    public object? Create(object key)
+    {
+        if (descriptors.FirstOrDefault(x => x.Key == key) is IDataTemplateDescriptor descriptor)
+        {
+            if (provider.GetRequiredKeyedService(descriptor.TemplateType, descriptor.Key) is { } template)
+            {
+                return template;
+            }
+        }
+
+        return default;
+    }
+}