散分求帮助，ListBox中添加Checkbox，数据项多时，会出现莫名其妙的勾选错乱

[panjinwen1984]

模拟器截图:

对应XAML：
<!--ContentPanel - 在此处放置其他内容-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ListBox Height="380" Margin="12,91,0,0" Name="listBox1" VerticalAlignment="Top" SelectionMode="Multiple">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<CheckBox x:Name="cbx_state" Tag="{Binding}"/>
<TextBlock x:Name="txt_string" Text="{Binding}" VerticalAlignment="Center" FontSize="34" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<TextBlock Height="66" HorizontalAlignment="Left" Margin="12,491,0,0" Name="textBlock1" Text="TextBlock" VerticalAlignment="Top" Width="438" />
</Grid>

后端初始化ListBox内容代码：
namespace PhoneApp4.UIs
{
public partial class MultiListBox3 : PhoneApplicationPage
{
public MultiListBox3()
{

InitializeComponent();

listBox1.ItemsSource = new List<string>() { "Option 1", "Option 2", "Option 3", "Option 4", "Option 5", "Option 6", "Option 2", "Option 3", "Option 4", "Option 5", "Option 6", "Option 2", "Option 3", "Option 4", "Option 5", "Option 6", "Option 2", "Option 3", "Option 4", "Option 5", "Option 6", "Option 2", "Option 3", "Option 4", "Option 5", "Option 6", "Option 2", "Option 3", "Option 4", "Option 5", "Option 6" };
}

运行截图，手动勾选了option1和option2：


拉到最下面，莫名其妙的option23被选中了


再拉回最顶上，option1的变成未选中状态了，邪门了


再往下拉，变成option24被选中了

在手机上运行也是这样的情况，只勾选一个不会出现错乱，勾选2个或以上，ListBox的滚动条再动一动，选项就莫名其妙的错乱了，但用代码检测选中状态是对的，就是显示的内容错误

[gxingmin]

没刷新过来？