Add project files.

UI/WPF/TemplateGeneratorControl.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace TheXamlGuy.UI.WPF;
+
+public class TemplateGeneratorControl : ContentControl
+{
+    internal static readonly DependencyProperty FactoryProperty =
+        DependencyProperty.Register("Factory", typeof(Func<object>),
+            typeof(TemplateGeneratorControl), new PropertyMetadata(null, OnFactoryPropertyChanged));
+
+    private static void OnFactoryPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
+    {
+        if (dependencyObject is TemplateGeneratorControl sender && args.NewValue is not null)
+        {
+            Func<object> factory = (Func<object>)args.NewValue;
+            sender.Content = factory();
+        }
+    }
+}