How to Change scrollbar style of Listbox in WPF

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WPF

Hi, I am trying to change the scrollbar in the listbox. I try'd many way to Change that. If the scroll is changed means the Listbox items are not showing. So i put grid to show both. But that also not working. Any one knows please help me in this.

<Style x:Key="mylists" TargetType="{x:Type ListBox}">
       <Setter Property="SnapsToDevicePixels" Value="true"/>
       <Setter Property="OverridesDefaultStyle" Value="true"/>
       <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
       <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
       <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
       <Setter Property="MinWidth" Value="120"/>
       <Setter Property="MinHeight" Value="95"/>
           <Setter Property="Template">
           <Setter.Value>
               <ControlTemplate TargetType="{x:Type ListBox}">
                       <Border x:Name="bd" Background="White">
                       <ScrollViewer Margin="0" Focusable="false" >
                           <Grid>
                               <Grid.ColumnDefinitions>
                                   <ColumnDefinition Width="80*" />
                                   <ColumnDefinition Width="Auto" MinWidth="{TemplateBinding MinWidth}"/>
                               </Grid.ColumnDefinitions>
                               <StackPanel Margin="2" IsItemsHost="True">
                               </StackPanel>
                               <ScrollBar Orientation="Vertical" Margin="0,0" HorizontalAlignment="Right" Grid.Column="1">
                                   <ScrollBar.Template>
                                       <ControlTemplate>
                                           <Track x:Name="PART_Track">
                                               <Track.DecreaseRepeatButton>
                                                   <RepeatButton Background="{x:Null}"/>
                                               </Track.DecreaseRepeatButton>
                                               <Track.IncreaseRepeatButton>
                                                   <RepeatButton Background="{x:Null}" />
                                               </Track.IncreaseRepeatButton>
                                               <Track.Thumb>
                                                   <Thumb Background="Gray" />
                                               </Track.Thumb>
                                           </Track>
                                       </ControlTemplate>
                                   </ScrollBar.Template>
                               </ScrollBar>
                           </Grid>
                       </ScrollViewer>
                   </Border>
                   <ControlTemplate.Triggers>

                   <Trigger Property="IsGrouping" Value="true">
                       <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                   </Trigger>
                   </ControlTemplate.Triggers>
               </ControlTemplate>
           </Setter.Value>
       </Setter>
   </Style>