Creating a Blend like Scrollbar

<ResourceDictionary
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
	<SolidColorBrush x:Key="ListBorder" Color="#FFA5ACB2"/>
    <LinearGradientBrush x:Key="ListBoxBg" StartPoint="0,0" EndPoint="1,0">        
        <GradientStop Offset="0" Color="#555555"></GradientStop>
        <GradientStop Offset="1" Color="#555555"></GradientStop>
    </LinearGradientBrush>
    <LinearGradientBrush x:Key="itemSelectedBrush" StartPoint="0,0" EndPoint="1,0">
        <GradientStop Offset="0" Color="#efefef"></GradientStop>
        <GradientStop Offset="1" Color="#aaaaaa"></GradientStop>
    </LinearGradientBrush>
    
    <Style TargetType="{x:Type ListBox}">
        <Setter Property="Background" >
            <Setter.Value>
                <StaticResource ResourceKey="ListBoxBg"></StaticResource>
            </Setter.Value>
        </Setter>
            <Setter Property="BorderBrush" Value="{StaticResource ListBorder}"/>
		<Setter Property="BorderThickness" Value="1"/>
		<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
		<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
		<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
		<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
		<Setter Property="VerticalContentAlignment" Value="Center"/>
		<Setter Property="Template">
			<Setter.Value>
				<ControlTemplate TargetType="{x:Type ListBox}">
                    <ControlTemplate.Resources>
                        <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="#555555"/>
                    </ControlTemplate.Resources>
					<Border SnapsToDevicePixels="true" x:Name="Bd" 
                            Background="{TemplateBinding Background}" 
                            BorderBrush="{TemplateBinding BorderBrush}" 
                            BorderThickness="{TemplateBinding BorderThickness}">
						<ScrollViewer Focusable="false" Padding="{TemplateBinding Padding}">
                            <ItemsPresenter
                                SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
						</ScrollViewer>
					</Border>
					<ControlTemplate.Triggers>
						<Trigger Property="IsEnabled" Value="false">
							<Setter Property="Background" 
                                    TargetName="Bd" 
                                    Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
						</Trigger>
						<Trigger Property="IsGrouping" Value="true">
							<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
						</Trigger>
					</ControlTemplate.Triggers>
				</ControlTemplate>
			</Setter.Value>
		</Setter>
	</Style>
	<!-- Resource dictionary entries should be defined here. -->
    <Style TargetType="{x:Type ListBoxItem}">
        <Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
        <Setter Property="Foreground" Value="White"></Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListBoxItem}">
                    <Border Name="Border" BorderThickness="0"
                            CornerRadius="0" Padding="1" >
                        <Border.Background>
                            <SolidColorBrush Color="#555555" x:Name="BorderBg"></SolidColorBrush>
                        </Border.Background>
                        <ContentPresenter />
                    </Border>
                    <ControlTemplate.Triggers>
            <Trigger Property="IsSelected" Value="True">
              <Setter Property="Background" TargetName="Border" Value="{StaticResource itemSelectedBrush}" />
                            <Setter Property="Foreground" Value="#333333"></Setter>
               </Trigger>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter TargetName="Border" Property="BorderBrush" Value="#acacac"></Setter>
                    <Trigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <ColorAnimation Storyboard.TargetName="BorderBg" 
                                                Storyboard.TargetProperty="Color"
                                                To="#999999" Duration="0:0:0.1"></ColorAnimation>
                                
                            </Storyboard>
                        </BeginStoryboard>
                    </Trigger.EnterActions>
                    <Trigger.ExitActions>
                        <BeginStoryboard>
                            <Storyboard>
<ColorAnimation Storyboard.TargetName="BorderBg" Storyboard.TargetProperty="Color"
        Duration="0:0:0.3">
</ColorAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </Trigger.ExitActions>
                </Trigger>
                        
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>