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58 lines
3.3 KiB
Markdown
58 lines
3.3 KiB
Markdown
---
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title: "Expander Styles and Templates"
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ms.date: "03/30/2017"
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helpviewer_keywords:
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- "styles [WPF], Expander"
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- "ControlTemplate [WPF], Expander"
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- "templates [WPF], Expander"
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- "Expander [WPF], styles and templates"
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- "states [WPF], Expander"
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- "parts [WPF], Expander"
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ms.assetid: da2e5a1c-5230-4c21-98a5-59c7895facd7
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---
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# Expander Styles and Templates
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This topic describes the styles and templates for the <xref:System.Windows.Controls.Expander> control. You can modify the default <xref:System.Windows.Controls.ControlTemplate> to give the control a unique appearance. For more information, see [Create a template for a control](/dotnet/desktop-wpf/themes/how-to-create-apply-template).
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## Expander Parts
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The <xref:System.Windows.Controls.Expander> control does not have any named parts.
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## Expander States
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The following table lists the visual states for the <xref:System.Windows.Controls.Expander> control.
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|VisualState Name|VisualStateGroup Name|Description|
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|-|-|-|
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|Normal|CommonStates|The default state.|
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|MouseOver|CommonStates|The mouse pointer is positioned over the control.|
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|Disabled|CommonStates|The control is disabled.|
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|Focused|FocusStates|The control has focus.|
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|Unfocused|FocusStates|The control does not have focus.|
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|Expanded|ExpansionStates|The control is expanded.|
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|Collapsed|ExpansionStates|The control is not expanded.|
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|ExpandDown|ExpandDirectionStates|The control expands down.|
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|ExpandUp|ExpandDirectionStates|The control expands up.|
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|ExpandLeft|ExpandDirectionStates|The control expands left.|
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|ExpandRight|ExpandDirectionStates|The control expands right.|
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|Valid|ValidationStates|The control uses the <xref:System.Windows.Controls.Validation> class and the <xref:System.Windows.Controls.Validation.HasError%2A?displayProperty=nameWithType> attached property is `false`.|
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|InvalidFocused|ValidationStates|The <xref:System.Windows.Controls.Validation.HasError%2A?displayProperty=nameWithType> attached property is `true` has the control has focus.|
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|InvalidUnfocused|ValidationStates|The <xref:System.Windows.Controls.Validation.HasError%2A?displayProperty=nameWithType> attached property is `true` has the control does not have focus.|
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## Expander ControlTemplate Example
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The following example shows how to define a <xref:System.Windows.Controls.ControlTemplate> for the <xref:System.Windows.Controls.Expander> control.
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[!code-xaml[ControlTemplateExamples#Expander](~/samples/snippets/csharp/VS_Snippets_Wpf/ControlTemplateExamples/CS/resources/expander.xaml#expander)]
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The preceding example uses one or more of the following resources.
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[!code-xaml[ControlTemplateExamples#Resources](~/samples/snippets/csharp/VS_Snippets_Wpf/ControlTemplateExamples/CS/resources/shared.xaml#resources)]
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For the complete sample, see [Styling with ControlTemplates Sample](https://github.com/Microsoft/WPF-Samples/tree/master/Styles%20&%20Templates/IntroToStylingAndTemplating).
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## See also
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- <xref:System.Windows.FrameworkElement.Style%2A>
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- <xref:System.Windows.Controls.ControlTemplate>
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- [Control Styles and Templates](control-styles-and-templates.md)
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- [Control Customization](control-customization.md)
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- [Styling and Templating](/dotnet/desktop-wpf/fundamentals/styles-templates-overview)
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- [Create a template for a control](/dotnet/desktop-wpf/themes/how-to-create-apply-template)
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