Вы можете подражать визуальному эффекту, оставаясь на экране, удалив «FocusVisual» в CellStyle. Вся строка будет по-прежнему выделена, но выбранная ячейка не будет отличаться от других ячеек в строке.
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
x:Class="SO_DataGridVertical.MainPage"
Width="640" Height="480">
<UserControl.Resources>
<Style x:Key="DataGridCellStyle1" TargetType="sdk:DataGridCell">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Stretch"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="sdk:DataGridCell">
<Grid x:Name="Root" Background="{TemplateBinding Background}">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CurrentStates">
<VisualState x:Name="Regular"/>
<VisualState x:Name="Current">
<Storyboard>
<!--<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisual"/>
-->
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ValidationStates">
<VisualState x:Name="Valid"/>
<VisualState x:Name="Invalid">
<Storyboard>
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="InvalidVisualElement"/>
<!--<ColorAnimation Duration="0" To="#FFFFFFFF" Storyboard.TargetProperty="(Fill).Color" Storyboard.TargetName="FocusVisual"/>
-->
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
</VisualStateGroup>
<VisualStateGroup x:Name="InteractionStates">
<VisualState x:Name="Display"/>
<VisualState x:Name="Editing"/>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Unfocused"/>
<VisualState x:Name="Focused"/>
</VisualStateGroup>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected"/>
<VisualState x:Name="Selected"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<!--<Rectangle x:Name="FocusVisual" Fill="#66FFFFFF" HorizontalAlignment="Stretch" IsHitTestVisible="false" Opacity="0" Stroke="#FF6DBDD1" StrokeThickness="1" VerticalAlignment="Stretch"/>-->
<ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
<Rectangle x:Name="InvalidVisualElement" HorizontalAlignment="Stretch" IsHitTestVisible="False" Opacity="0" Stroke="#FFDC000C" StrokeThickness="1" VerticalAlignment="Stretch"/>
<Rectangle x:Name="RightGridLine" Loaded="RightGridLine_Loaded" Grid.Column="1" VerticalAlignment="Stretch" Width="1"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource SampleDataSource}}">
<sdk:DataGrid ItemsSource="{Binding Collection, Mode=OneWay}" CellStyle="{StaticResource DataGridCellStyle1}" />
</Grid>