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dotnet-desktop-guide/framework/wpf/controls/how-to-implement-an-adorner.md

@@ -0,0 +1,28 @@
+---
+title: "How to: Implement an Adorner"
+ms.date: "03/30/2017"
+dev_langs: 
+  - "csharp"
+  - "vb"
+helpviewer_keywords: 
+  - "adorners [WPF], implementing"
+ms.assetid: 56ae32b6-0599-455c-b52f-2ff97e6f1ec2
+---
+# How to: Implement an Adorner
+This example shows a minimal adorner implementation.  
+  
+## Notes for Implementers  
+ It is important to note that adorners do not include any inherent rendering behavior; ensuring that an adorner renders is the responsibility of the adorner implementer.   A common way of implementing rendering behavior is to override the <xref:System.Windows.UIElement.OnRender%2A> method and use one or more <xref:System.Windows.Media.DrawingContext> objects to render the adorner's visuals as needed (as shown in this example).  
+  
+## Example  
+  
+### Description  
+ A custom adorner is created by implementing a class that inherits from the abstract <xref:System.Windows.Documents.Adorner> class.  The example adorner simply adorns the corners of a <xref:System.Windows.UIElement> with circles by overriding the <xref:System.Windows.UIElement.OnRender%2A> method.  
+  
+### Code  
+ [!code-csharp[Adorners_SimpleCircleAdorner#_SimpleCircleAdornerBody](~/samples/snippets/csharp/VS_Snippets_Wpf/Adorners_SimpleCircleAdorner/CSharp/Window1.xaml.cs#_simplecircleadornerbody)]
+ [!code-vb[Adorners_SimpleCircleAdorner#_SimpleCircleAdornerBody](~/samples/snippets/visualbasic/VS_Snippets_Wpf/Adorners_SimpleCircleAdorner/VisualBasic/Window1.xaml.vb#_simplecircleadornerbody)]  
+  
+## See also
+
+- [Adorners Overview](adorners-overview.md)