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18 lines
1021 B
Markdown
18 lines
1021 B
Markdown
---
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title: "How to: Override the Logical Tree"
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ms.date: "03/30/2017"
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helpviewer_keywords:
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- "overriding the logical tree [WPF]"
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- "logical tree [WPF], overriding"
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ms.assetid: 0ae4d074-8113-4b06-b4fa-e0f39d4967a6
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---
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# How to: Override the Logical Tree
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Although it is not necessary in most cases, advanced control authors have the option to override the logical tree.
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## Example
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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.
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[!code-csharp[LogicalOverride#SingletonPanel](~/samples/snippets/csharp/VS_Snippets_Wpf/LogicalOverride/CSharp/SDKSampleLibrary/class1.cs#singletonpanel)]
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For more information on the logical tree, see [Trees in WPF](trees-in-wpf.md).
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