combobox loses selected value while scrolling listview

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C#

Windows

XAML

combobox

ListView

, +

I am working on a win 8 app. I have a listview with combobox inside datatemlate. Now problem occurs when I scroll listview, combobox loses selectedvalue infact while scrolling listview combobox selectedValueChanged event fires.

<ListView x:Name="lstQuestion" Margin="0 10 0 0" SelectionMode="None"                         
    ItemsSource="{Binding QuestionsViewModel.AuditQuestionList}" IsItemClickEnabled="True" >
    <ListView.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Vertical" Margin="10 0 0 0">
                <TextBlock Text="{Binding QuestionText}" Padding="14,10,10,10" FontSize="14" TextWrapping="Wrap"/>
                <StackPanel Orientation="Horizontal">

                    <Rectangle ToolTipService.ToolTip="{Binding QuestionText}" x:Name="rectAnswerColor"  Fill="{Binding ProgressColor, Converter={StaticResource HexToSolidColorConverter}}" Width="5" Height="40"/>
                    <ComboBox x:Name="cmbanswer" Margin="10 0 0 0"   Height="40" HorizontalAlignment="Left" Width="200" ItemsSource="{Binding PossibleAnswerList}" Visibility="{Binding QuestionType, Converter={StaticResource IntToVisibility1}}" SelectionChanged="cmbanswer_SelectionChanged_1" />

                    <TextBox x:Name="txtAnswer" Margin="10 0 0 0" Height="40" Width="200" Visibility="{Binding QuestionType, Converter={StaticResource IntToVisibility2}}" LostFocus="txtAnswer_LostFocus_1"/>

                    <Image x:Name="imgcamera" Source="/Assets/camera.png" Height="35" Width="30" Margin="15 0 0 0" Tapped="imgcamera_Tapped_1"/>

                    <Border x:Name="brdBackground" Margin="-8 -20 0 0" removed="Red" CornerRadius="10" Height="22" Width="22" >
                        <TextBlock x:Name="tblImageCount" Text="+"  Foreground="White" VerticalAlignment="Center" HorizontalAlignment="Center" FontSize="12"/>
                    </Border>

                    <Image x:Name="imgnote" Source="/Assets/notepad.png" Height="30" Width="30" Margin="15 0 0 0" Tapped="imgnote_Tapped"/>
                </StackPanel>
            </StackPanel>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

Is there any problem?