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    <p>Your performance issue is due to not using <code>IsVirtualizingWhenGrouping</code></p> <p>You mentionned that using <code>IsVirtualizingWhenGrouping</code> was locking your application, and this is a known WPF issue (see : <a href="http://connect.microsoft.com/VisualStudio/feedback/details/780146/freeze-when-using-virtualizingpanel-isvirtualizingwhengrouping" rel="noreferrer">http://connect.microsoft.com/VisualStudio/feedback/details/780146/freeze-when-using-virtualizingpanel-isvirtualizingwhengrouping</a> for more information on this bug happening when having a custom GroupStyle and <code>IsVirtualizingWhenGrouping</code> set to true)</p> <p>Here is a quick workaroung to solve your issue : You just have to add an expander in the GroupStyle ControlTemplate. You'll then be able to use <code>IsVirtualizingWhenGrouping</code> and then have good performances when scrolling/Resizing columns. </p> <p>Here is the code that works on my machine : (I put everything directly in MainWindow to simplify a bit)</p> <pre><code>&lt;Window x:Class="WpfApplication21.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;Style x:Key="lvStyle" TargetType="{x:Type ListView}" &gt; &lt;Setter Property="ListView.ItemsSource" Value="{Binding}"/&gt; &lt;Setter Property="ListView.View"&gt; &lt;Setter.Value&gt; &lt;GridView&gt; &lt;GridViewColumn Header="Name"&gt; &lt;GridViewColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Name}"/&gt; &lt;/DataTemplate&gt; &lt;/GridViewColumn.CellTemplate&gt; &lt;/GridViewColumn&gt; &lt;GridViewColumn Header="Date"&gt; &lt;GridViewColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Date}"/&gt; &lt;/DataTemplate&gt; &lt;/GridViewColumn.CellTemplate&gt; &lt;/GridViewColumn&gt; &lt;GridViewColumn Header="Desc"&gt; &lt;GridViewColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Desc}"/&gt; &lt;/DataTemplate&gt; &lt;/GridViewColumn.CellTemplate&gt; &lt;/GridViewColumn&gt; &lt;/GridView&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;ListView x:Name="ListView1" Style="{DynamicResource lvStyle}" VirtualizingPanel.IsVirtualizing="True" VirtualizingPanel.IsVirtualizingWhenGrouping="True"&gt; &lt;ListView.GroupStyle&gt; &lt;GroupStyle&gt; &lt;GroupStyle.ContainerStyle&gt; &lt;Style TargetType="{x:Type GroupItem}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type GroupItem}"&gt; &lt;Expander IsExpanded="True"&gt; &lt;DockPanel&gt; &lt;Border DockPanel.Dock="Top"&gt; &lt;TextBlock x:Name="groupItem" Text="{Binding ItemCount, StringFormat={}({0} Results)}"&gt;&lt;/TextBlock&gt; &lt;/Border&gt; &lt;ItemsPresenter x:Name="groupItemPresenter" DockPanel.Dock="Bottom"&gt;&lt;/ItemsPresenter&gt; &lt;/DockPanel&gt; &lt;/Expander&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/GroupStyle.ContainerStyle&gt; &lt;/GroupStyle&gt; &lt;/ListView.GroupStyle&gt; &lt;/ListView&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p><strong>EDIT:</strong> Here is a ControlTemplate that "hides" the expander. It's the original one from which I removed the unnecessary parts : </p> <pre><code>&lt;ControlTemplate x:Key="CustomExpanderControlTemplate" TargetType="{x:Type Expander}"&gt; &lt;Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="3" SnapsToDevicePixels="True"&gt; &lt;DockPanel&gt; &lt;ToggleButton x:Name="HeaderSite" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" DockPanel.Dock="Top" Foreground="{TemplateBinding Foreground}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" MinWidth="0" MinHeight="0" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"&gt; &lt;ToggleButton.FocusVisualStyle&gt; &lt;Style&gt; &lt;Setter Property="Control.Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate&gt; &lt;Border&gt; &lt;Rectangle Margin="0" SnapsToDevicePixels="True" Stroke="Black" StrokeThickness="1" StrokeDashArray="1 2"/&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/ToggleButton.FocusVisualStyle&gt; &lt;ToggleButton.Style&gt; &lt;Style TargetType="{x:Type ToggleButton}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type ToggleButton}"&gt; &lt;Border Padding="{TemplateBinding Padding}"&gt; &lt;Grid Background="Transparent" SnapsToDevicePixels="False"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="0" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Left" Margin="4,0,0,0" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/ToggleButton.Style&gt; &lt;/ToggleButton&gt; &lt;ContentPresenter x:Name="ExpandSite" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" DockPanel.Dock="Bottom" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/&gt; &lt;/DockPanel&gt; &lt;/Border&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsExpanded" Value="True"&gt; &lt;Setter Property="Visibility" TargetName="ExpandSite" Value="Visible"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="ExpandDirection" Value="Right"&gt; &lt;Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Right"/&gt; &lt;Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Left"/&gt; &lt;Setter Property="Style" TargetName="HeaderSite"&gt; &lt;Setter.Value&gt; &lt;Style TargetType="{x:Type ToggleButton}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type ToggleButton}"&gt; &lt;Border Padding="{TemplateBinding Padding}"&gt; &lt;Grid Background="Transparent" SnapsToDevicePixels="False"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="19"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid&gt; &lt;Grid.LayoutTransform&gt; &lt;TransformGroup&gt; &lt;RotateTransform Angle="-90"/&gt; &lt;/TransformGroup&gt; &lt;/Grid.LayoutTransform&gt; &lt;Ellipse x:Name="circle" Fill="Transparent" HorizontalAlignment="Center" Height="19" Stroke="DarkGray" VerticalAlignment="Center" Width="19"/&gt; &lt;Path x:Name="arrow" Data="M1,1.5L4.5,5 8,1.5" HorizontalAlignment="Center" SnapsToDevicePixels="False" Stroke="#FF666666" StrokeThickness="2" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; &lt;ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Center" Margin="0,4,0,0" Grid.Row="1" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Top"/&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsChecked" Value="True"&gt; &lt;Setter Property="Data" TargetName="arrow" Value="M1,4.5L4.5,1 8,4.5"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsMouseOver" Value="True"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF222222"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsPressed" Value="True"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/&gt; &lt;Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF003366"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="False"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="DarkGray"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF666666"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Trigger&gt; &lt;Trigger Property="ExpandDirection" Value="Up"&gt; &lt;Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Top"/&gt; &lt;Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Bottom"/&gt; &lt;Setter Property="Style" TargetName="HeaderSite"&gt; &lt;Setter.Value&gt; &lt;Style TargetType="{x:Type ToggleButton}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type ToggleButton}"&gt; &lt;Border Padding="{TemplateBinding Padding}"&gt; &lt;Grid Background="Transparent" SnapsToDevicePixels="False"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="19"/&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid&gt; &lt;Grid.LayoutTransform&gt; &lt;TransformGroup&gt; &lt;RotateTransform Angle="180"/&gt; &lt;/TransformGroup&gt; &lt;/Grid.LayoutTransform&gt; &lt;Ellipse x:Name="circle" Fill="Transparent" HorizontalAlignment="Center" Height="19" Stroke="DarkGray" VerticalAlignment="Center" Width="19"/&gt; &lt;Path x:Name="arrow" Data="M1,1.5L4.5,5 8,1.5" HorizontalAlignment="Center" SnapsToDevicePixels="False" Stroke="#FF666666" StrokeThickness="2" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; &lt;ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="1" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Left" Margin="4,0,0,0" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsChecked" Value="True"&gt; &lt;Setter Property="Data" TargetName="arrow" Value="M1,4.5L4.5,1 8,4.5"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsMouseOver" Value="True"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF222222"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsPressed" Value="True"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/&gt; &lt;Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF003366"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="False"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="DarkGray"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF666666"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Trigger&gt; &lt;Trigger Property="ExpandDirection" Value="Left"&gt; &lt;Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Left"/&gt; &lt;Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Right"/&gt; &lt;Setter Property="Style" TargetName="HeaderSite"&gt; &lt;Setter.Value&gt; &lt;Style TargetType="{x:Type ToggleButton}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type ToggleButton}"&gt; &lt;Border Padding="{TemplateBinding Padding}"&gt; &lt;Grid Background="Transparent" SnapsToDevicePixels="False"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="19"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid&gt; &lt;Grid.LayoutTransform&gt; &lt;TransformGroup&gt; &lt;RotateTransform Angle="90"/&gt; &lt;/TransformGroup&gt; &lt;/Grid.LayoutTransform&gt; &lt;Ellipse x:Name="circle" Fill="Transparent" HorizontalAlignment="Center" Height="19" Stroke="DarkGray" VerticalAlignment="Center" Width="19"/&gt; &lt;Path x:Name="arrow" Data="M1,1.5L4.5,5 8,1.5" HorizontalAlignment="Center" SnapsToDevicePixels="False" Stroke="#FF666666" StrokeThickness="2" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; &lt;ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Center" Margin="0,4,0,0" Grid.Row="1" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Top"/&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsChecked" Value="True"&gt; &lt;Setter Property="Data" TargetName="arrow" Value="M1,4.5L4.5,1 8,4.5"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsMouseOver" Value="True"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF222222"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsPressed" Value="True"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/&gt; &lt;Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF003366"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="False"&gt; &lt;Setter Property="Stroke" TargetName="circle" Value="DarkGray"/&gt; &lt;Setter Property="Fill" TargetName="circle" Value="Transparent"/&gt; &lt;Setter Property="Stroke" TargetName="arrow" Value="#FF666666"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsEnabled" Value="False"&gt; &lt;Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; </code></pre> <p>You can use it by setting it in the group style : </p> <pre><code>&lt;Expander IsExpanded="True" Template="{DynamicResource CustomExpanderControlTemplate}"&gt; 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    1. COThank you!! This is an amazing answer! Also, I never knew about the `IsVirtualizingWhenGrouping` bug!
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    2. COHey @Dom, you're very welcome ! Glad to see my answer helped !
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    3. COI did a test where I added 10,000 objects every 15 seconds. Even after 300,000 results, I had zero problems! This answer is **phenomenal**!! Thank you again, @Sisyphe! I would award you another 1,000 points if I could!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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