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I'm using .NET 4.5/VS2012, and I have a ListView looks something like this <ListView VirtualizingPanel.IsContainerVirtualizable="True" VirtualizingPanel.IsVirtualizing="True" VirtualizingPanel.IsVirtualizingWhenGrouping="True" Grid.Row="1" Name="eventLogList" Margin="5,0,5,0" BorderBrush="Black" BorderThickness="2" ItemsSource="{Binding EventLogs}" SelectedItem="{Binding SelectedEventLog}" local:ListViewSorter.CustomListViewSorter="EventLogViewer.UI.EventLogItemComparer" SelectionMode="Single"> <ListView.GroupStyle> <GroupStyle HidesIfEmpty="False"> <GroupStyle.ContainerStyle> <Style TargetType="GroupItem"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="GroupItem"> <Expander IsExpanded="True"> <Expander.Header> <TextBlock FontSize="20" TextWrapping="Wrap" Margin="0,10,0,5" > <Bold><TextBlock Text="{Binding Name}"/></Bold> - <TextBlock FontSize="20" Text="{Binding ItemCount}"/> logs </TextBlock> </Expander.Header> <ItemsPresenter/> </Expander> </ControlTemplate> </Setter.Value> </Setter> </Style> </GroupStyle.ContainerStyle> </GroupStyle> </ListView.GroupStyle> <ListView.View> <GridView> <GridViewColumn Header="event id" Width="120"

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