问Windows Phone - LongListSelector中的ToggleSwitch (滚动时不变)

EN

<phone:LongListSelector Name="ModuleList" 
                        Margin="0,0,0,0" 
                        Padding="0,0,0,0"
                        Style="{StaticResource LLSFloatingScrollbarStyle}"
                        ItemTemplate="{StaticResource ModuleListTemplate}"
                        ItemsSource="{Binding Modules}"/>

<DataTemplate x:Key="ModuleListTemplate">
        <StackPanel Margin="{Binding StackModuleMargin}">
...
        <toolkit:ToggleSwitch x:Name="LockSwitch" 
                              Grid.Row="2" Margin="0,4,0,-26" Padding="0"
                              Content="" SwitchForeground="{StaticResource TrackitoOrange}"
                              IsChecked="{Binding IsToggleCheck, Mode=TwoWay}">
                 <i:Interaction.Triggers>
                       <i:EventTrigger EventName="Click">
                             <Command:EventToCommand Command="{Binding DataContext.LockSwitchTapCommand, ElementName=LayoutRoot}"
                                                     CommandParameter="{Binding}" />
                       </i:EventTrigger>
                </i:Interaction.Triggers>
        </toolkit:ToggleSwitch>
...