Merge pull request #2910 from unoplatform/mergify/bp/release/beta/2.1…

…/pr-2903

fix(elevatedview): Make sure the `ElevatedView` propagates its `TemplatedParent`. (bp #2903)

src/Uno.UI.Toolkit/ElevatedView.cs

@@ -46,6 +46,10 @@ public sealed partial class ElevatedView : Control
 		public ElevatedView()
 		{
 			DefaultStyleKey = typeof(ElevatedView);
+
+#if !NETFX_CORE
+			Loaded += (snd, evt) => SynchronizeContentTemplatedParent();
+#endif
 		}
 
 		protected override void OnApplyTemplate()
@@ -104,6 +108,25 @@ public CornerRadius CornerRadius
 			get => (CornerRadius)GetValue(CornerRadiusProperty);
 			set => SetValue(CornerRadiusProperty, value);
 		}
+
+		protected internal override void OnTemplatedParentChanged(DependencyPropertyChangedEventArgs e)
+		{
+			base.OnTemplatedParentChanged(e);
+
+			// This is required to ensure that FrameworkElement.FindName can dig through the tree after
+			// the control has been created.
+			SynchronizeContentTemplatedParent();
+		}
+
+		private void SynchronizeContentTemplatedParent()
+		{
+			// Manual propagation of the templated parent to the content property
+			// until we get the propagation running properly
+			if (ElevatedContent is IFrameworkElement content)
+			{
+				content.TemplatedParent = this.TemplatedParent;
+			}
+		}
 #endif
 
 		private static void OnChanged(DependencyObject snd, DependencyPropertyChangedEventArgs evt) => ((ElevatedView)snd).UpdateElevation();
@@ -115,6 +138,10 @@ private void UpdateElevation()
 				return; // not initialized yet
 			}
 
+#if !NETFX_CORE
+			SynchronizeContentTemplatedParent();
+#endif
+
 			if (Background == null)
 			{
 				this.SetElevationInternal(0, default);