WPF中listBox控件滚动条重绘问题

<Style TargetType="ScrollViewer">

      <Setter Property="HorizontalContentAlignment" Value="Left" />

      <Setter Property="VerticalContentAlignment" Value="Top" />

      <Setter Property="VerticalScrollBarVisibility" Value="Visible" />

      <Setter Property="Padding" Value="4"/>

      <Setter Property="BorderThickness" Value="1"/>

      <Setter Property="BorderBrush">

          <Setter.Value>

              <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

                  <GradientStop Color="#FFA3AEB9" Offset="0"/>

                  <GradientStop Color="#FF8399A9" Offset="0.375"/>

                  <GradientStop Color="#FF718597" Offset="0.375"/>

                  <GradientStop Color="#FF617584" Offset="1"/>

              </LinearGradientBrush>

          </Setter.Value>

      </Setter>

      <Setter Property="Template">

          <Setter.Value>

              <ControlTemplate TargetType="ScrollViewer">

                  <Border CornerRadius="2" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">

                      <Grid Background="{TemplateBinding Background}">

                          <Grid.RowDefinitions>

                              <RowDefinition Height="*"/>

                              <RowDefinition Height="Auto"/>

                          </Grid.RowDefinitions>

                          <Grid.ColumnDefinitions>

                              <ColumnDefinition Width="*"/>

                              <ColumnDefinition Width="Auto"/>

                          </Grid.ColumnDefinitions>



                          <ScrollContentPresenter x:Name="ScrollContentPresenter"

                                                  Cursor="{TemplateBinding Cursor}"

                                                  Margin="{TemplateBinding Padding}"

                                                  ContentTemplate="{TemplateBinding ContentTemplate}"/>



                          <Rectangle Grid.Column="1" Grid.Row="1" Fill="#FFE9EEF4"/>



                          <ScrollBar x:Name="VerticalScrollBar" Width="18"

                                     IsTabStop="False"

                                     Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"

                                     Grid.Column="1" Grid.Row="0" Orientation="Vertical"

                                     ViewportSize="{TemplateBinding ViewportHeight}"

                                     Maximum="{TemplateBinding ScrollableHeight}"

                                     Minimum="0"

                                     Value="{TemplateBinding VerticalOffset}"

                                     Margin="0,-1,-1,-1"/>



                          <ScrollBar x:Name="HorizontalScrollBar" Height="18"

                                     IsTabStop="False"

                                     Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"

                                     Grid.Column="0" Grid.Row="1" Orientation="Horizontal"

                                     ViewportSize="{TemplateBinding ViewportWidth}"

                                     Maximum="{TemplateBinding ScrollableWidth}"

                                     Minimum="0"

                                     Value="{TemplateBinding HorizontalOffset}"

                                     Margin="-1,0,-1,-1"/>



                      </Grid>

                  </Border>

              </ControlTemplate>

          </Setter.Value>

      </Setter>

  </Style>

补充：.NET技术 ,  C#

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