WPF ListView display header scrollbar when it's no items

<ListView Name="PART_ListView" Grid.Row="2" Height="Auto" SelectionMode="Single" BorderThickness="0,0,0,0" Background="{x:Null}">
    <ListView.Resources>
        <Style x:Key="{x:Static GridView.GridViewScrollViewerStyleKey}" TargetType="{x:Type ScrollViewer}">
            <Setter Property="Focusable" Value="false"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ScrollViewer}">
                        <Grid SnapsToDevicePixels="true" Background="{TemplateBinding Background}">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <DockPanel Margin="{TemplateBinding Padding}">
                                <ScrollViewer x:Name="PART_HeaderHorizontalScrollView" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" DockPanel.Dock="Top">
                                    <GridViewHeaderRowPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" AllowsColumnReorder="{Binding TemplatedParent.View.AllowsColumnReorder, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderContainerStyle="{Binding TemplatedParent.View.ColumnHeaderContainerStyle, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderContextMenu="{Binding TemplatedParent.View.ColumnHeaderContextMenu, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderStringFormat="{Binding TemplatedParent.View.ColumnHeaderStringFormat, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderTemplate="{Binding TemplatedParent.View.ColumnHeaderTemplate, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderTemplateSelector="{Binding TemplatedParent.View.ColumnHeaderTemplateSelector, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderToolTip="{Binding TemplatedParent.View.ColumnHeaderToolTip, RelativeSource={RelativeSource TemplatedParent}}" Columns="{Binding TemplatedParent.View.Columns, RelativeSource={RelativeSource TemplatedParent}}" Height="34"/>
                                </ScrollViewer>
                                <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.DirectionalNavigation="Local" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" CanContentScroll="{TemplateBinding CanContentScroll}"/>
                            </DockPanel>
                            <ScrollBar x:Name="PART_HorizontalScrollBar" Cursor="Arrow" Grid.Row="1" Maximum="{TemplateBinding ScrollableWidth}" Minimum="0.0" Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" Orientation="Horizontal" ViewportSize="{TemplateBinding ViewportWidth}">
                                <ScrollBar.Visibility>
                                    <MultiBinding Converter="{StaticResource ListViewContentScrollbarVisibilityConverter}">
                                        <Binding Path="TemplatedParent" RelativeSource="{RelativeSource TemplatedParent}"/>
                                        <Binding Path="ComputedHorizontalScrollBarVisibility" RelativeSource="{RelativeSource TemplatedParent}"/>
                                    </MultiBinding>
                                </ScrollBar.Visibility>
                            </ScrollBar>
                            <ScrollBar x:Name="PART_VerticalScrollBar" Cursor="Arrow" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Grid.Column="1" Maximum="{TemplateBinding ScrollableHeight}" Minimum="0.0" Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" Orientation="Vertical" ViewportSize="{TemplateBinding ViewportHeight}"/>
                            <DockPanel Background="{Binding Background, ElementName=PART_VerticalScrollBar}" Grid.Column="1" Grid.Row="1" LastChildFill="false">
                                <Rectangle Fill="White" Width="1" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" DockPanel.Dock="Left"/>
                                <Rectangle Fill="White" Height="1" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" DockPanel.Dock="Top"/>
                            </DockPanel>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </ListView.Resources>
    <ListView.View>
        <GridView AllowsColumnReorder="False">
        </GridView>
    </ListView.View>
</ListView>

 

下面的Converter的Class:

 

public class ListViewContentScrollbarVisibilityConverter : IMultiValueConverter
{
    #region Methods

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        ListView listView = (ListView)values[0];
        Visibility visibility = (Visibility)values[1];

        if (listView.Items.Count == 0)
        {
            return Visibility.Hidden;
        }
        else
        {               
            return visibility;
        }
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion Methods
}