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37 lines
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37 lines
2.0 KiB
Markdown
---
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title: "How to: Position a Custom Context Menu in a RichTextBox"
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ms.date: "03/30/2017"
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ms.custom: devdivchpfy22
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description: Learn how to position a Custom Context Menu in a RichTextBox.
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "custom context menus [WPF], positioning"
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- "positioning custom context menus [WPF]"
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- "RichTextBox control [WPF], positioning custom context menus"
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- "context menus [WPF], positioning"
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ms.assetid: bf77c930-a546-4573-9a56-9af345ba189a
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---
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# How to: Position a Custom Context Menu in a RichTextBox
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This example shows how to position a custom context menu for a <xref:System.Windows.Controls.RichTextBox>.
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When you implement a custom context menu for a **RichTextBox**, you are responsible for handling the placement of the context menu. By default, a custom context menu is opened at the center of the **RichTextBox**.
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## Add a listener for the ContextMenuOpening event
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To override the default placement behavior, add a listener for the <xref:System.Windows.FrameworkContentElement.ContextMenuOpening> event. The following example shows how to do this programmatically.
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[!code-csharp[RichTextBox_ContextMenu#_AddListener](~/samples/snippets/csharp/VS_Snippets_Wpf/RichTextBox_ContextMenu/CSharp/app.xaml.cs#_addlistener)]
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[!code-vb[RichTextBox_ContextMenu#_AddListener](~/samples/snippets/visualbasic/VS_Snippets_Wpf/RichTextBox_ContextMenu/VisualBasic/app.xaml.vb#_addlistener)]
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## Implementation of ContextMenuOpening event listener
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The following example shows an implementation the corresponding <xref:System.Windows.FrameworkContentElement.ContextMenuOpening> event listener.
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[!code-csharp[RichTextBox_ContextMenu#_ListenerBody](~/samples/snippets/csharp/VS_Snippets_Wpf/RichTextBox_ContextMenu/CSharp/app.xaml.cs#_listenerbody)]
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[!code-vb[RichTextBox_ContextMenu#_ListenerBody](~/samples/snippets/visualbasic/VS_Snippets_Wpf/RichTextBox_ContextMenu/VisualBasic/app.xaml.vb#_listenerbody)]
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## See also
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- [RichTextBox Overview](richtextbox-overview.md)
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- [TextBox Overview](textbox-overview.md)
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