Как да запазите безпроблемното превъртане на gridsplitter в контролата ListBox

Имам ListBox с Grid в неговия шаблон за данни. В Grid имам контрол Splitter. Сега проблемът е: когато обвържа източника на елемента на списъчното поле, тогава вътрешно се генерират множество решетки и поради тези решетки моят контрол на разделителя не работи. Работи непредсказуемо. Това означава, че когато преместя контрола на сплитера наляво, той се движи плавно, но когато се опитам да го преместя от друг ред, той не се движи назад. Моля, помогнете ми по този въпрос.

Моля, вижте примерния код за повече справки:

<Window x:Class="MultiColumnList.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MultiColumnList"
Title="Window1" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="400" d:DesignWidth="400" SizeToContent="WidthAndHeight">
<Grid >
    <Grid.Resources>
        <XmlDataProvider x:Key="BlogData" XPath="Blogs/Blog">
            <x:XData>
                <Blogs xmlns="">
                    <Blog>
                        <BlogSite>simplegeek.com</BlogSite>
                        <Blogger OnlineStatus="Offline">Chris Anderson</Blogger>
                        <Url>http://simplegeek.com</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>fortes.com</BlogSite>
                        <Blogger OnlineStatus="Offline">Fil Fortes</Blogger>
                        <Url>http://fortes.com/work</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>Longhorn Blogs</BlogSite>
                        <Blogger OnlineStatus="Online">Rob Relyea</Blogger>
                        <Url>http://www.longhornblogs.com/rrelyea/</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>designerslove.net</BlogSite>
                        <Blogger OnlineStatus="Online">Nathan Dunlap</Blogger>
                        <Url>http://designerslove.net/</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>blogs.msdn.com</BlogSite>
                        <Blogger OnlineStatus="Online">Karsten Januszewski</Blogger>
                        <Url>http://blogs.msdn.com/karstenj</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>weblogs.asp.net</BlogSite>
                        <Blogger OnlineStatus="Online">Greg Schecter</Blogger>
                        <Url>http://weblogs.asp.net/greg_schechter</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>blogs.msdn.com</BlogSite>
                        <Blogger OnlineStatus="Online">Tim Sneath</Blogger>
                        <Url>http://blogs.msdn.com/tims/</Url>
                    </Blog>

                    <Blog>
                        <BlogSite>weblogs.asp.net</BlogSite>
                        <Blogger OnlineStatus="Offline">Marcelo Lopez-Ruiz</Blogger>
                        <Url>http://weblogs.asp.net/marcelolr/</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>blogs.msdn.com</BlogSite>
                        <Blogger OnlineStatus="Online">Kevin Moore</Blogger>
                        <Url>http://blogs.msdn.com/okoboji/default.aspx</Url>
                    </Blog>
                    <Blog>
                        <BlogSite>laurenlavoie.com</BlogSite>
                        <Blogger OnlineStatus="Offline">Lauren Lavoie</Blogger>
                        <Url>http://laurenlavoie.com/</Url>
                    </Blog>
                </Blogs>
            </x:XData>
        </XmlDataProvider>

        <DataTemplate x:Key="BlogDataTemplate">

            <Grid TextBlock.FontSize="12" LayoutUpdated="Grid_LayoutUpdated">

                <Grid.ColumnDefinitions>
                    <ColumnDefinition x:Name="LeftColumn" Width="Auto"   SharedSizeGroup="BloggerColumn"/>
                    <ColumnDefinition  x:Name="Center" Width="*"  SharedSizeGroup="BlogSiteColumn"/>
                    <ColumnDefinition x:Name="Right" Width="*"  SharedSizeGroup="OnlineStatusColumn"/>
                </Grid.ColumnDefinitions>

                <TextBlock Grid.Column="0" Margin="10,0,10,0" Text="{Binding XPath=Blogger}"/>
                <GridSplitter Grid.Column="1" Width="2"  HorizontalAlignment="Center" Background="Black"  DragCompleted="GridSplitter_DragCompleted"/>

                <TextBlock Grid.Column="2" Margin="10,0,10,0" Text="{Binding XPath=Blogger/@OnlineStatus}"/>
            </Grid>
        </DataTemplate>

        <ControlTemplate x:Key="Header" TargetType="{x:Type Button}">
            <Border Background="LightGray" 
                TextBlock.Foreground="white" 
                TextBlock.FontSize="20" 
                Padding="10,3,10,4">
                <ContentPresenter/>
            </Border>
        </ControlTemplate>

        <Grid x:Key="ListHeader" Margin="5" >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" SharedSizeGroup="BloggerColumn"/>
                <ColumnDefinition Width="*" SharedSizeGroup="BlogSiteColumn"/>
                <ColumnDefinition Width="*" SharedSizeGroup="BloggerOnlineStatusColumn"/>
            </Grid.ColumnDefinitions>
            <Button Grid.Column="0" Template="{StaticResource Header}">Blogger</Button>
            <GridSplitter Grid.Column="1" Width="2"  Background="Black" HorizontalAlignment="Stretch" DragCompleted="GridSplitter_DragCompleted"  />
            <Button Grid.Column="2" Template="{StaticResource Header}">Status</Button>
        </Grid>


        <Style x:Key="HeaderedScrollViewer" TargetType="{x:Type ScrollViewer}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ScrollViewer}">
                        <Grid 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 DockPanel.Dock="Top"
                                          local:SetHorizontalOffset.Offset="{Binding 
                                                RelativeSource={RelativeSource TemplatedParent}, 
                                                Path=HorizontalOffset}" 
                                          HorizontalScrollBarVisibility="Hidden"
                                          VerticalScrollBarVisibility="Hidden"
                                          Focusable="false"
                                          Content="{StaticResource ListHeader}">
                                </ScrollViewer>

                                <ScrollContentPresenter Name="PART_ScrollContentPresenter"
                                    KeyboardNavigation.DirectionalNavigation="Local"/>
                            </DockPanel>

                            <ScrollBar Name="PART_HorizontalScrollBar"
                                Orientation="Horizontal"
                                Grid.Row="1"
                                Maximum="{TemplateBinding ScrollableWidth}"
                                ViewportSize="{TemplateBinding ViewportWidth}"
                                Value="{TemplateBinding HorizontalOffset}"
                                Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>

                            <ScrollBar Name="PART_VerticalScrollBar"
                                Grid.Column="1"
                                Maximum="{TemplateBinding ScrollableHeight}"
                                ViewportSize="{TemplateBinding ViewportHeight}"
                                Value="{TemplateBinding VerticalOffset}"
                                Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="{x:Type ListBox}" TargetType="{x:Type ListBox}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <ScrollViewer Style="{StaticResource HeaderedScrollViewer}" 
                                      Grid.IsSharedSizeScope="True">
                            <StackPanel IsItemsHost="true"/>
                        </ScrollViewer>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

    </Grid.Resources>

    <ListBox ItemsSource="{Binding Source={StaticResource BlogData}}" 
             ItemTemplate="{StaticResource BlogDataTemplate}" Height="400" Width="600"/>
</Grid>