WPF DataGrid ScrollBar Style

 <DataGrid.Resources>
                            <Style TargetType="{x:Type ScrollBar}">
                                <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
                                <Setter Property="Stylus.IsFlicksEnabled" Value="false"/>
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
                                <Setter Property="Width" Value="10"/>
                                <Setter Property="MinWidth" Value="10"/>
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="{x:Type ScrollBar}">
                                            <Grid x:Name="Bg" SnapsToDevicePixels="true" Background="#7FBFBFBF">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height="0.00001*"/>
                                                </Grid.RowDefinitions>
                                                <Track HorizontalAlignment="Center" Name="PART_Track" Width="{TemplateBinding Width}" Maximum="{TemplateBinding Maximum}" Minimum="{TemplateBinding Minimum}"
                                    Value="{TemplateBinding Value}"  IsDirectionReversed="true">
                                                    <Track.DecreaseRepeatButton>
                                                        <RepeatButton Template="{StaticResource scroll_background}" Command="ScrollBar.LineUpCommand"  />
                                                    </Track.DecreaseRepeatButton>
                                                    <Track.IncreaseRepeatButton>
                                                        <RepeatButton Template="{StaticResource scroll_background}" Command="ScrollBar.LineDownCommand" />
                                                    </Track.IncreaseRepeatButton>
                                                    <Track.Thumb>
                                                        <Thumb Style="{StaticResource scroll_thumb_style}" >
                                                        </Thumb>
                                                    </Track.Thumb>
                                                </Track>
                                            </Grid>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                                <Style.Triggers>
                                    <Trigger Property="Orientation" Value="Horizontal">
                                        <Setter Property="Width" Value="Auto"/>
                                        <Setter Property="MinWidth" Value="0"/>
                                        <Setter Property="Height" Value="10"/>
                                        <Setter Property="MinHeight" Value="10"/>
                                        <Setter Property="Template">
                                            <Setter.Value>
                                                <ControlTemplate TargetType="{x:Type ScrollBar}">
                                                    <Grid x:Name="Bg" SnapsToDevicePixels="true" Background="#7FA7A7A7">
                                                        <Grid.ColumnDefinitions>
                                                            <ColumnDefinition Width="0.00001*"/>
                                                        </Grid.ColumnDefinitions>
                                                        <Track x:Name="PART_Track" Grid.Column="1" IsEnabled="{TemplateBinding IsMouseOver}">
                                                            <Track.DecreaseRepeatButton>
                                                                <RepeatButton Template="{StaticResource scroll_background}" Command="ScrollBar.LineUpCommand"  />
                                                            </Track.DecreaseRepeatButton>
                                                            <Track.IncreaseRepeatButton>
                                                                <RepeatButton Template="{StaticResource scroll_background}" Command="ScrollBar.LineDownCommand" />
                                                            </Track.IncreaseRepeatButton>
                                                            <Track.Thumb>
                                                                <Thumb  Style="{DynamicResource scroll_thumb_stylecrosswise}" Height="8"/>
                                                            </Track.Thumb>
                                                        </Track>
                                                    </Grid>
                                                </ControlTemplate>
                                            </Setter.Value>
                                        </Setter>
                                    </Trigger>
                                </Style.Triggers>
                            </Style>
                            <!--<Style TargetType="ScrollBar">
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="ScrollBar">
                                            <Grid Width="15">
                                                <Border Width="13" HorizontalAlignment="Center" CornerRadius="5" Background="#33555555">
                                                </Border>
                                                <Track HorizontalAlignment="Center" Name="PART_Track" Width="{TemplateBinding Width}" Maximum="{TemplateBinding Maximum}" Minimum="{TemplateBinding Minimum}"
                                    Value="{TemplateBinding Value}"  IsDirectionReversed="true">
                                                    <Track.DecreaseRepeatButton>
                                                        <RepeatButton Template="{StaticResource scroll_background}" Command="ScrollBar.LineUpCommand"  />
                                                    </Track.DecreaseRepeatButton>
                                                    <Track.IncreaseRepeatButton>
                                                        <RepeatButton Template="{StaticResource scroll_background}" Command="ScrollBar.LineDownCommand" />
                                                    </Track.IncreaseRepeatButton>
                                                    <Track.Thumb>
                                                        <Thumb Style="{StaticResource scroll_thumb_style}" >
                                                        </Thumb>
                                                    </Track.Thumb>
                                                </Track>
                                            </Grid>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>-->
                        </DataGrid.Resources>

<ControlTemplate x:Key="scroll_background" TargetType="RepeatButton">
        <Border Background="Transparent">
        </Border>
    </ControlTemplate>

    <Style x:Key="scroll_thumb_style" TargetType="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="Thumb">
                    <Rectangle Width="10" Fill="#7D7D7D" RadiusX="5" RadiusY="5">
                    </Rectangle>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="scroll_thumb_stylecrosswise" TargetType="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="Thumb">
                    <Rectangle  Fill="#7D7D7D" RadiusX="5" RadiusY="5">
                    </Rectangle>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>