WIP: tests that pass

Somehow these pass, but the sample here has an issue:

* dotnet#23199

Past links related to `RadioButton`:

* dotnet#18365
* dotnet#21151

src/Controls/tests/DeviceTests/Elements/NavigationPage/NavigationPageTests.cs

@@ -358,7 +358,11 @@ public async Task ChildPagesDoNotLeak()
 						new ContentView(),
 						new Label(),
 						new ScrollView(),
-						new RadioButton(),
+						new RadioButton
+						{
+							ControlTemplate = new ControlTemplate(() =>
+								new Border { Content = new Grid { Children = { new ContentPresenter() } } })
+						}
 					}
 				};
 				NavigationPage.SetTitleView(page, new Label() { Text = "Title View" });

src/Controls/tests/DeviceTests/Memory/MemoryTests.cs

@@ -37,6 +37,7 @@ void SetupBuilder()
 				handlers.AddHandler<GraphicsView, GraphicsViewHandler>();
 				handlers.AddHandler<Label, LabelHandler>();
 				handlers.AddHandler<ListView, ListViewRenderer>();
+				handlers.AddHandler<Layout, LayoutHandler>();
 				handlers.AddHandler<Picker, PickerHandler>();
 				handlers.AddHandler<Polygon, PolygonHandler>();
 				handlers.AddHandler<Polyline, PolylineHandler>();
@@ -45,6 +46,7 @@ void SetupBuilder()
 				handlers.AddHandler<ImageButton, ImageButtonHandler>();
 				handlers.AddHandler<ImageCell, ImageCellRenderer>();
 				handlers.AddHandler<IndicatorView, IndicatorViewHandler>();
+				handlers.AddHandler<RadioButton, RadioButtonHandler>();
 				handlers.AddHandler<RefreshView, RefreshViewHandler>();
 				handlers.AddHandler<IScrollView, ScrollViewHandler>();
 				handlers.AddHandler<SearchBar, SearchBarHandler>();
@@ -135,6 +137,7 @@ public async Task PagesDoNotLeak(Type type)
 	[InlineData(typeof(Editor))]
 	[InlineData(typeof(Frame))]
 	[InlineData(typeof(GraphicsView))]
+	[InlineData(typeof(Grid))]
 	[InlineData(typeof(Image))]
 	[InlineData(typeof(ImageButton))]
 	[InlineData(typeof(IndicatorView))]
@@ -143,6 +146,7 @@ public async Task PagesDoNotLeak(Type type)
 	[InlineData(typeof(Picker))]
 	[InlineData(typeof(Polygon))]
 	[InlineData(typeof(Polyline))]
+	[InlineData(typeof(RadioButton))]
 	[InlineData(typeof(RefreshView))]
 	[InlineData(typeof(ScrollView))]
 	[InlineData(typeof(SearchBar))]
@@ -214,6 +218,11 @@ public async Task HandlerDoesNotLeak(Type type)
 				webView.Source = new HtmlWebViewSource { Html = "<p>hi</p>" };
 				await Task.Delay(1000);
 			}
+			else if (view is TemplatedView templated)
+			{
+				templated.ControlTemplate = new ControlTemplate(() =>
+					new Border { Content = new Grid { Children = { new ContentPresenter() } } });
+			}
 			var handler = CreateHandler<LayoutHandler>(layout);
 			viewReference = new WeakReference(view);
 			handlerReference = new WeakReference(view.Handler);