Fixed Title not updating on parent page (#743)

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla43527.cs

@@ -0,0 +1,43 @@
+using System;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 43527, "[UWP] Detail title does not update when wrapped in a NavigationPage", PlatformAffected.WinRT)]
+	public class Bugzilla43527 : TestMasterDetailPage
+	{
+		protected override void Init()
+		{
+			Master = new ContentPage
+			{
+				Title = "Master",
+				BackgroundColor = Color.Red
+			};
+
+			Detail = new NavigationPage(new TestPage());
+		}
+
+		class TestPage : ContentPage
+		{
+			public TestPage()
+			{
+				Title = "Test Page";
+
+				Content = new StackLayout
+				{
+					Children = {
+						new Label { Text = "Hello Page" },
+						new Button { Text = "Change Title", Command = new Command(() => Title = $"New Title: {DateTime.Now.Second}") }
+					}
+				};
+			}
+		}
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems

@@ -144,6 +144,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43313.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43469.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43516.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43527.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44047.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43941.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43663.cs" />

Xamarin.Forms.Platform.WinRT/NavigationPageRenderer.cs

@@ -314,6 +314,8 @@ void OnCurrentPagePropertyChanged(object sender, PropertyChangedEventArgs e)
 				UpdateBackButtonTitle();
 			else if (e.PropertyName == NavigationPage.HasNavigationBarProperty.PropertyName)
 				UpdateTitleVisible();
+			else if (e.PropertyName == Page.TitleProperty.PropertyName)
+				UpdateTitleOnParents();
 		}
 
 		void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)