Styling Scrollviewer Horizontal ScrollBar ne marche pas

bonjour tout le monde

Je suis en train de styliser mon scrollviewer mais l'horizontal scrollbar ne marche pas alors que la vertical oui...

Qu'est ce que j'ai pu oublié ?

Ressources

Code:

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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:Apeiron.Styles">
    <Style x:Key="ScrollBarPageButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Border Background="{DynamicResource transparentBackGround}" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
 
    <!-- VerticalScrolScrollBarThumbBar -->
    <Style x:Key="ScrollBarThumb" TargetType="{x:Type Thumb}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Thumb}">
                    <Border 
          CornerRadius="2"
          Background="{TemplateBinding Background}"
          BorderBrush="{TemplateBinding BorderBrush}"
          BorderThickness="1" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
 
    <!-- VerticalScrollBar -->
    <ControlTemplate x:Key="VerticalScrollBar" TargetType="{x:Type ScrollBar}">
        <Grid Background="{DynamicResource transparentBackGround}" >
            <Grid.RowDefinitions>
                <RowDefinition Height="0.00001*"/>
            </Grid.RowDefinitions>
            <Border
      Grid.RowSpan="1"
      CornerRadius="2"
      Background="{DynamicResource transparentBackGround}" />
            <Track
      Name="PART_Track"
      Grid.Row="1"
      IsDirectionReversed="true">
                <Track.DecreaseRepeatButton>
                    <RepeatButton 
          Style="{StaticResource ScrollBarPageButton}"
          Command="ScrollBar.PageUpCommand" />
                </Track.DecreaseRepeatButton>
                <Track.Thumb>
                    <Thumb Name="thumb"
          Style="{StaticResource ScrollBarThumb}" 
          Margin="3,0,3,0"  
          Background="{StaticResource LightBrush}"
          BorderBrush="{StaticResource NormalBorderBrush}" />
                </Track.Thumb>
                <Track.IncreaseRepeatButton>
                    <RepeatButton 
          Style="{StaticResource ScrollBarPageButton}"
          Command="ScrollBar.PageDownCommand" />
                </Track.IncreaseRepeatButton>
 
            </Track>
        </Grid>
    </ControlTemplate>
 
    <!-- HorizontalScrollBar -->
    <ControlTemplate x:Key="HorizontalScrollBar" TargetType="{x:Type ScrollBar}">
        <Grid Background="{DynamicResource transparentBackGround}" >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="0.00001*"/>
            </Grid.ColumnDefinitions>
            <Border
      Grid.ColumnSpan="1"
      CornerRadius="2"
      Background="{DynamicResource transparentBackGround}" />
            <Track 
      Name="PART_Track"
      Grid.Column="1"
      IsDirectionReversed="False">
                <Track.DecreaseRepeatButton>
                    <RepeatButton 
          Style="{StaticResource ScrollBarPageButton}"
          Command="ScrollBar.PageLeftCommand" />
                </Track.DecreaseRepeatButton>
                <Track.Thumb>
                    <Thumb Name="thumb"
          Style="{StaticResource ScrollBarThumb}" 
          Margin="0,3,0,3"  
          Background="{TemplateBinding Background}"
          BorderBrush="{TemplateBinding BorderBrush}" />
                </Track.Thumb>
                <Track.IncreaseRepeatButton>
                    <RepeatButton 
          Style="{StaticResource ScrollBarPageButton}"
          Command="ScrollBar.PageRightCommand" />
                </Track.IncreaseRepeatButton>
            </Track>
        </Grid>
    </ControlTemplate>
 
    <!-- ScrollBar -->
    <Style x:Key="{x:Type ScrollBar}" TargetType="{x:Type ScrollBar}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Style.Triggers>
            <Trigger Property="Orientation" Value="Horizontal">
                <Setter Property="Width" Value="Auto"/>
                <Setter Property="Height" Value="14" />
                <Setter Property="Template" Value="{StaticResource HorizontalScrollBar}" />
            </Trigger>
            <Trigger Property="Orientation" Value="Vertical">
                <Setter Property="Width" Value="14"/>
                <Setter Property="Height" Value="Auto" />
                <Setter Property="Template" Value="{StaticResource VerticalScrollBar}" />
            </Trigger>
        </Style.Triggers>
    </Style>
    <!-- ScrollViewerStyle -->
    <Style x:Key="PopupScroll" TargetType="{x:Type ScrollViewer}">
        <Setter Property="OverridesDefaultStyle" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="True"/>
        <Setter Property="HorizontalScrollBarVisibility" Value="Visible" />
        <Setter Property="VerticalScrollBarVisibility" Value="Visible" />
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="ContextMenu" Value="{x:Null}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollViewer}">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
 
                        <ScrollContentPresenter Grid.Column="0"/>
 
                        <ScrollBar Name="PART_VerticalScrollBar"
                            Grid.Column="1"
                            Value="{TemplateBinding VerticalOffset}"
                            Maximum="{TemplateBinding ScrollableHeight}"
                            ViewportSize="{TemplateBinding ViewportHeight}"
                            Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
                        <ScrollBar Name="PART_HorizontalScrollBar"
                            Orientation="Horizontal"
                            Grid.Row="1"
                            Grid.Column="0"
                            Value="{TemplateBinding HorizontalOffset}"
                            Maximum="{TemplateBinding ScrollableWidth}"
                            ViewportSize="{TemplateBinding ViewportWidth}"
                            Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

mon fichier App

Code:

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<Application 
  x:Class="Apeiron.App"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  >
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                             <ResourceDictionary Source="Styles\ScrollViewer.xaml"/>
 
            </ResourceDictionary.MergedDictionaries>
 
        </ResourceDictionary>
 
 
</Application.Resources>
</Application>