Silverlight 4.0 Accordion 解决ScrollViewer 的问题

Silverlight 4.0 开发中，使用Accordion ，在Accordion 中动态添加AccordionItem ，可以设置AccordionItem 的个数，但很难解决ScrollViewer的问题 ，即外框出现滚动条的问题

查了几个国外的网站都没有解决办法！~经常会碰到许多奇怪的问题！~在这里分析下我的解决方案！~

          <ScrollViewer Margin="0" Grid.Row="1">
                            <toolkit:Accordion Grid.Row="1" SelectionChanged="UserAcc_SelectionChanged" Name="UserAcc" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"  AccordionButtonStyle="{StaticResource AccordionButtonStyle1}">
                            </toolkit:Accordion>
            </ScrollViewer>

在Accordion 外套一个ScrollViewer ，添加SelectionChanged的方法

        /// <summary>
        /// 获取所选择，主要处理Accordion的高度和AccordionItem的高度
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void UserAcc_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            try
            {
                AccordionItem tem = this.UserAcc.SelectedItem as AccordionItem;
                if (null != tem)
                {
                    ///根据AccordionItem 的个数来设置高度
                    this.UserAcc.Height = 600 + this.UserAcc.Items.Count * 32;//600,32 这两个数字是根据页面设计实际大大小来定的
                    tem.MaxHeight = 610;//设置最大高度，解决内部出现空白的BUG
                    // tem.ContentTargetSize 可以测试内部的实际高度
                    tem.UpdateLayout();
                }
                else
                {
                    if (this.UserAcc.Items.Count < 15)
                    {
                        this.UserAcc.Height = 500;
                    }
                    else
                    {
                        this.UserAcc.Height = this.UserAcc.Items.Count * 32 + 50;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }