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    <p>You can disable the Horizontal Grid Lines which are drawn in code by specifying <code>GridLinesVisibility="Vertical"</code> in the <code>DataGrid</code>. You could then re-template <code>DataGridRow</code> and add the dashed line at the end of each row</p> <p>Looks like this:</p> <p><img src="https://i.stack.imgur.com/n1C5F.png" alt="enter image description here"></p> <pre><code>&lt;DataGrid GridLinesVisibility="Vertical"&gt; &lt;DataGrid.RowStyle&gt; &lt;Style TargetType="DataGridRow"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type DataGridRow}"&gt; &lt;Border x:Name="DGR_Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"&gt; &lt;SelectiveScrollingGrid&gt; &lt;SelectiveScrollingGrid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto"/&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/SelectiveScrollingGrid.ColumnDefinitions&gt; &lt;SelectiveScrollingGrid.RowDefinitions&gt; &lt;RowDefinition Height="*"/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;/SelectiveScrollingGrid.RowDefinitions&gt; &lt;DataGridCellsPresenter Grid.Column="1" ItemsPanel="{TemplateBinding ItemsPanel}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/&gt; &lt;DataGridDetailsPresenter Grid.Column="1" Grid.Row="1" SelectiveScrollingGrid.SelectiveScrollingOrientation="{Binding AreRowDetailsFrozen, ConverterParameter={x:Static SelectiveScrollingOrientation.Vertical}, Converter={x:Static DataGrid.RowDetailsScrollingConverter}, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" Visibility="{TemplateBinding DetailsVisibility}"/&gt; &lt;DataGridRowHeader Grid.RowSpan="2" SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical" Visibility="{Binding HeadersVisibility, ConverterParameter={x:Static DataGridHeadersVisibility.Row}, Converter={x:Static DataGrid.HeadersVisibilityConverter}, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/&gt; &lt;Path Grid.Row="2" Grid.ColumnSpan="2" Data="M0,0.5 L1,0.5" Stretch="Fill" Stroke="Black" StrokeThickness="1" StrokeDashArray="1.0 2.0"/&gt; &lt;/SelectiveScrollingGrid&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/DataGrid.RowStyle&gt; &lt;!-- ... --&gt; &lt;/DataGrid&gt; </code></pre> <p><strong>Edit:</strong> Here is the Template for the 3.5 <code>DataGrid</code> in the toolkit</p> <pre><code>&lt;Custom:DataGrid GridLinesVisibility="Vertical"&gt; &lt;Custom:DataGrid.RowStyle&gt; &lt;Style TargetType="Custom:DataGridRow"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type Custom:DataGridRow}"&gt; &lt;Border x:Name="DGR_Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"&gt; &lt;Custom:SelectiveScrollingGrid&gt; &lt;Custom:SelectiveScrollingGrid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto"/&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/Custom:SelectiveScrollingGrid.ColumnDefinitions&gt; &lt;Custom:SelectiveScrollingGrid.RowDefinitions&gt; &lt;RowDefinition Height="*"/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;/Custom:SelectiveScrollingGrid.RowDefinitions&gt; &lt;Custom:DataGridCellsPresenter Grid.Column="1" ItemsPanel="{TemplateBinding ItemsPanel}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/&gt; &lt;Custom:DataGridDetailsPresenter Grid.Column="1" Grid.Row="1" Visibility="{TemplateBinding DetailsVisibility}"&gt; &lt;Custom:SelectiveScrollingGrid.SelectiveScrollingOrientation&gt; &lt;Binding Path="AreRowDetailsFrozen" RelativeSource="{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Custom:DataGrid}}"&gt; &lt;Binding.ConverterParameter&gt; &lt;Custom:SelectiveScrollingOrientation&gt;Vertical&lt;/Custom:SelectiveScrollingOrientation&gt; &lt;/Binding.ConverterParameter&gt; &lt;/Binding&gt; &lt;/Custom:SelectiveScrollingGrid.SelectiveScrollingOrientation&gt; &lt;/Custom:DataGridDetailsPresenter&gt; &lt;Custom:DataGridRowHeader Grid.RowSpan="2" Custom:SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical"&gt; &lt;Custom:DataGridRowHeader.Visibility&gt; &lt;Binding Path="HeadersVisibility" RelativeSource="{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Custom:DataGrid}}"&gt; &lt;Binding.ConverterParameter&gt; &lt;Custom:DataGridHeadersVisibility&gt;Row&lt;/Custom:DataGridHeadersVisibility&gt; &lt;/Binding.ConverterParameter&gt; &lt;/Binding&gt; &lt;/Custom:DataGridRowHeader.Visibility&gt; &lt;/Custom:DataGridRowHeader&gt; &lt;Path Grid.Row="2" Grid.ColumnSpan="2" Data="M0,0.5 L1,0.5" Stretch="Fill" Stroke="Black" StrokeThickness="1" StrokeDashArray="1.0 2.0"/&gt; &lt;/Custom:SelectiveScrollingGrid&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Custom:DataGrid.RowStyle&gt; &lt;!-- ... --&gt; &lt;/Custom:DataGrid&gt; </code></pre>
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    1. COIve tried your sample code but it seems there is a problem with "Converter={x:Static dg:DataGrid.RowDetailsScrollingConverter}". The error says that DataGrid does not have a static member "RowDetailsScrollingConverter". I used WPFToolkit since I am using .net 3.5 and visual studio 2008.I have also checked in MSDN and confirmed that DataGrid has a static member "RowDetailsScrollingConverter". What am I missing?
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    2. COUpdated my answer with the `Template` for the 3.5 Toolkit `DataGrid`
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    3. COWhilst this may work, there's a reason they're drawn in code in the first place. I suggest you performance test some significant volumes of data in your grid - with and without the custom lines - before you commit to this approach. If you instead subclass `DataGridCell` and render the lines there, you'll likely see better performance.
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