Initial WPF content migrated (#17)

* Reset branch for WPF changes * Convert BMP to PNG; fix link-out-of-scope err * Add snippets for WPF... 6794 files!!!! * Add missing snippets * update file updated between migration * Fix paths to include * update breadcrumb and toc * fix index links * fix index links * fix index links * fix markdown
2026-09-09 07:56:08 +02:00 · 2020-09-04 09:46:28 -07:00
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+---
+title: "How to: Override the Logical Tree"
+ms.date: "03/30/2017"
+helpviewer_keywords: 
+  - "overriding the logical tree [WPF]"
+  - "logical tree [WPF], overriding"
+ms.assetid: 0ae4d074-8113-4b06-b4fa-e0f39d4967a6
+---
+# How to: Override the Logical Tree
+Although it is not necessary in most cases, advanced control authors have the option to override the logical tree.  
+  
+## Example  
+ This example describes how to subclass <xref:System.Windows.Controls.StackPanel> to override the logical tree, in this case to enforce a behavior that the panel may only have and will only render a single child element. This isn't necessarily a practically desirable behavior, but is shown here as a means of illustrating the scenario for overriding an element's normal logical tree.  
+  
+ [!code-csharp[LogicalOverride#SingletonPanel](~/samples/snippets/csharp/VS_Snippets_Wpf/LogicalOverride/CSharp/SDKSampleLibrary/class1.cs#singletonpanel)]  
+  
+ For more information on the logical tree, see [Trees in WPF](trees-in-wpf.md).