タイムラインのTreeView | Codetter（こーどったー）

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<TreeView ItemTemplate="{StaticResource StatusDataTemplate}" Margin="0" ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Hidden" ScrollViewer.CanContentScroll="True" BorderThickness="0" Background="Transparent" x:Name="listContent" 
         VirtualizingStackPanel.VirtualizationMode="Standard" VirtualizingStackPanel.IsVirtualizing="False"  ScrollViewer.PanningMode="VerticalOnly" ScrollViewer.PanningDeceleration="5" IsManipulationEnabled="True">
    <!--  VirtualizingStackPanel.IsVirtualizing="True" -->
    <TreeView.Resources>
        <sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarButtonHeightKey}">60</sys:Double>
    </TreeView.Resources>
    <TreeView.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel />
        </ItemsPanelTemplate>
    </TreeView.ItemsPanel>
    <TreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <EventSetter Event="MouseDown" Handler="OnItemMouseDown" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TreeViewItem}">
                        <ContentPresenter x:Name="PART_Header" ContentSource="Header" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Width">
                <Setter.Value>
                    <Binding Path="ActualWidth" 
                        RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType={x:Type ScrollContentPresenter}}" />
                </Setter.Value>
            </Setter>
        </Style>
    </TreeView.ItemContainerStyle>
</TreeView>
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