WPF上下滚动字幕

XAML代码：

<local:WorkSpaceContent x:Class="SunCreate.CombatPlatform.Client.NoticeMarquee"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:SunCreate.CombatPlatform.Client;assembly=SunCreate.CombatPlatform.Client"
             mc:Ignorable="d" 
             d:DesignHeight="35" d:DesignWidth="300" Loaded="WorkSpaceContent_Loaded" MouseEnter="WorkSpaceContent_MouseEnter" MouseLeave="WorkSpaceContent_MouseLeave">
    <local:WorkSpaceContent.Resources>
        <ControlTemplate x:Key="btnTemplate" TargetType="Button">
            <TextBlock Name="txt" Margin="5 0 5 0" Text="{TemplateBinding Content}" FontSize="12" Cursor="Hand" ToolTip="{TemplateBinding ToolTip}" Foreground="#fff" VerticalAlignment="Center"></TextBlock>
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="true">
                    <Setter TargetName="txt" Property="Foreground" Value="#ff5e5e"></Setter>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
        <Storyboard x:Key="storyboard">
            <DoubleAnimation  Duration="0:0:1" To="25" Storyboard.TargetName="stackPanel" Storyboard.TargetProperty="RenderTransform.Y"/>
        </Storyboard>
    </local:WorkSpaceContent.Resources>
    <Grid Background="#00a6da">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="60"></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <TextBlock Margin="15 0 5 0" Text="公告：" FontSize="12"  Foreground="#ffff33" VerticalAlignment="Center"></TextBlock>
        <ScrollViewer Grid.Column="1" Name="scrollViewer" HorizontalScrollBarVisibility="Hidden"
                      HorizontalContentAlignment="Stretch"
                      VerticalScrollBarVisibility="Hidden"
                       VerticalContentAlignment="Stretch" Height="25">
            <Border Height="25" >
                <StackPanel x:Name="stackPanel" Margin="0 -25 0 0" >
                    <StackPanel.RenderTransform>
                        <TranslateTransform />
                    </StackPanel.RenderTransform>
                    <Button Name="btn1" Height="25" Click="btn_Click" Template="{StaticResource btnTemplate}"></Button>
                    <Button Name="btn2" Height="25" Click="btn_Click" Template="{StaticResource btnTemplate}"></Button>
                    <Button Name="btn3" Height="25" Click="btn_Click" Template="{StaticResource btnTemplate}"></Button>
                </StackPanel>
            </Border>
        </ScrollViewer>
    </Grid>
</local:WorkSpaceContent>

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