WPF如何自定义ProgressBar滚动条样式

<Style TargetType="{x:Type ProgressBar}">   <Setter Property="FocusVisualStyle" Value="{x:Null}"/>   <Setter Property="SnapsToDevicePixels" Value="True"/>   <Setter Property="Height" Value="15"/>   <Setter Property="Background" Value="#6fae5f"/>   <Setter Property="FontSize" Value="10"/>   <Setter Property="Padding" Value="5,0"/>   <Setter Property="Template">    <Setter.Value>     <ControlTemplate TargetType="{x:Type ProgressBar}">      <Grid Background="#00000000">       <Grid.RowDefinitions>        <RowDefinition Height="Auto"/>       </Grid.RowDefinitions>       <VisualStateManager.VisualStateGroups>        <VisualStateGroup x:Name="CommonStates">         <VisualState x:Name="Determinate"/>         <VisualState x:Name="Indeterminate">          <Storyboard RepeatBehavior="Forever">           <PointAnimationUsingKeyFrames Storyboard.TargetName="Animation" Storyboard.TargetProperty="(UIElement.RenderTransformOrigin)">            <EasingPointKeyFrame KeyTime="0:0:0" Value="0.5,0.5"/>            <EasingPointKeyFrame KeyTime="0:0:1.5" Value="1.95,0.5"/>            <EasingPointKeyFrame KeyTime="0:0:3" Value="0.5,0.5"/>           </PointAnimationUsingKeyFrames>          </Storyboard>         </VisualState>        </VisualStateGroup>       </VisualStateManager.VisualStateGroups>              <Grid Height="{TemplateBinding Height}">        <Border Background="#000000" CornerRadius="7.5" Opacity="0.05"/>        <Border BorderBrush="#000000" BorderThickness="1" CornerRadius="7.5" Opacity="0.1"/>        <Grid Margin="{TemplateBinding BorderThickness}">         <Border x:Name="PART_Track"/>         <Grid x:Name="PART_Indicator" ClipToBounds="True" HorizontalAlignment="Left" >          <Grid.ColumnDefinitions>           <ColumnDefinition x:Name="width1"/>           <ColumnDefinition x:Name="width2" Width="0"/>          </Grid.ColumnDefinitions>          <Grid x:Name="Animation" RenderTransformOrigin="0.5,0.5">           <Grid.RenderTransform>            <TransformGroup>             <ScaleTransform ScaleY="-1" ScaleX="1"/>             <SkewTransform AngleY="0" AngleX="0"/>             <RotateTransform Angle="180"/>             <TranslateTransform/>            </TransformGroup>           </Grid.RenderTransform>           <Border Background="{TemplateBinding Background}" CornerRadius="7.5">            <Viewbox HorizontalAlignment="Left" StretchDirection="DownOnly" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="True">             <TextBlock Foreground="#ffffff" SnapsToDevicePixels="True" FontSize="{TemplateBinding FontSize}" VerticalAlignment="Center" Text="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Value,StringFormat={}{0}%}" RenderTransformOrigin="0.5,0.5">              <TextBlock.RenderTransform>               <TransformGroup>                <ScaleTransform ScaleY="1" ScaleX="-1"/>                <SkewTransform AngleY="0" AngleX="0"/>                <RotateTransform Angle="0"/>                <TranslateTransform/>               </TransformGroup>              </TextBlock.RenderTransform>             </TextBlock>            </Viewbox>           </Border>           <Border BorderBrush="#000000" BorderThickness="1" CornerRadius="7.5" Opacity="0.1"/>          </Grid>         </Grid>        </Grid>       </Grid>      </Grid>      <ControlTemplate.Triggers>              <Trigger Property="IsEnabled" Value="False">        <Setter Property="Background" Value="#c5c5c5"/>       </Trigger>       <Trigger Property="IsIndeterminate" Value="true">        <Setter TargetName="width1" Property="Width" Value="0.25*"/>        <Setter TargetName="width2" Property="Width" Value="0.725*"/>       </Trigger>      </ControlTemplate.Triggers>     </ControlTemplate>    </Setter.Value>   </Setter>  </Style>

<ProgressBar Height="15" Width="150" Value="40" Margin="10"/>