xaml – windows phone 8.1 ComboBox在项目数量更多时显示多个项

当组合框中有更多项目时,组合框将显示listpicker弹出窗口.如果我选择第一个并向下滚动,则会显示多个选项.但是ComboBox的SelectedItem将是我选择的.我修改了ListPickerFlyout的风格,并关闭了ListView的虚拟化.如果我这样做,ListView不会保留SelectedItem.这个ComboBox的错误？有没有解决这个问题

这是我修改的风格

<DataTemplate x:Key="ListPickerFlyoutPresenterContentTemplate" >
                <ListView VirtualizingStackPanel.VirtualizationMode="Recycling" SelectionMode="Single"   > 
                    <!--<ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <VirtualizingStackPanel/>
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>-->
                    <ListView.ItemContainerStyle>

                           <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="ListViewItem">
                                        <Border x:Name="OuterContainer" RenderTransformOrigin="0.5,0.5">
                                            <VisualStateManager.VisualStateGroups>
                                                <VisualStateGroup x:Name="CommonStates">
                                                    <VisualState x:Name="Normal" />
                                                    <VisualState x:Name="Pressed"/>

                                                    <VisualState x:Name="Disabled"/>
                                                                                                                                                        <VisualStateGroup.Transitions>
                                                        <VisualTransition From="Pressed" To="Normal" />


                                                    </VisualStateGroup.Transitions>
                                                </VisualStateGroup>
                                                <VisualStateGroup x:Name="SelectionStates">
                                                    <VisualState x:Name="Unselected" />
                                                    <VisualState x:Name="Selected">
                                                        <Storyboard>
                                                            <DoubleAnimation Storyboard.TargetName="CheckGlyph" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
                                                            <DoubleAnimation Storyboard.TargetName="SelectedCheckMark" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="contentPresenter" Storyboard.TargetProperty="Foreground" Duration="0">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Green" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentBorder" Storyboard.TargetProperty="Background">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ListPickerFlyoutPresenterSelectedItemBackgroundThemeBrush}" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState>
                                                    <VisualState x:Name="SelectedUnfocused">
                                                        <Storyboard>
                                                            <DoubleAnimation Storyboard.TargetName="CheckGlyph" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
                                                            <DoubleAnimation Storyboard.TargetName="SelectedCheckMark" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="contentPresenter" Storyboard.TargetProperty="Foreground" Duration="0">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Green" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentBorder" Storyboard.TargetProperty="Background">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ListPickerFlyoutPresenterSelectedItemBackgroundThemeBrush}" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState>
                                                </VisualStateGroup>
                                                <VisualStateGroup x:Name="DataVirtualizationStates">
                                                    <VisualState x:Name="DataAvailable" />
                                                    <VisualState x:Name="DataPlaceholder">

                                                    </VisualState>
                                                </VisualStateGroup>
                                                <VisualStateGroup x:Name="MultiSelectStates">
                                                    <VisualState x:Name="NoMultiSelect" />
                                                    <VisualState x:Name="ListMultiSelect">

                                                    </VisualState>
                                                    <VisualState x:Name="GridMultiSelect" />
                                                    <VisualStateGroup.Transitions>
                                                        <VisualTransition From="ListMultiSelect" To="NoMultiSelect" GeneratedDuration="0:0:0.15" />
                                                        <VisualTransition From="NoMultiSelect" To="ListMultiSelect" GeneratedDuration="0:0:0.15" />
                                                    </VisualStateGroup.Transitions>
                                                </VisualStateGroup>
                                                <!--<VisualStateGroup x:Name="HighlightStates">
                                                    <VisualState x:Name="NoHighlight" />
                                                    <VisualState x:Name="Highlighted">
                                                        <Storyboard>
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="contentPresenter" Storyboard.TargetProperty="Foreground" Duration="0">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Red" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentBorder" Storyboard.TargetProperty="Background">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ListPickerFlyoutPresenterSelectedItemBackgroundThemeBrush}" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState>
                                                </VisualStateGroup>-->
                                            </VisualStateManager.VisualStateGroups>

                                                            <Grid>
                                                                <ContentPresenter x:Name="contentPresenter"
                                        ContentTransitions="{TemplateBinding ContentTransitions}"
                                        ContentTemplate="{TemplateBinding ContentTemplate}"
                                        Content="{TemplateBinding Content}"
                                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                        Margin="{TemplateBinding Padding}"
                                        Style="{ThemeResource FlyoutPickerListViewItemContentPresenterStyle}" />
                                                                 <!--The 'Xg' text simulates the amount of space one line of text will occupy.
                                            In the DataPlaceholder state,the Content is not loaded yet so we
                                            approximate the size of the item using placeholder text.--> 
                                                                <TextBlock x:Name="PlaceholderTextBlock"
                                 Opacity="0"
                                 Text="Xg"
                                 Foreground="{x:Null}"
                                 Margin="{TemplateBinding Padding}"
                                 IsHitTestVisible="False"
                                 AutomationProperties.AccessibilityView="Raw"/>
                                                                <Rectangle x:Name="PlaceholderRect"
                                 Visibility="Collapsed"
                                 Fill="{ThemeResource FlyoutBackgroundThemeBrush}"
                                 IsHitTestVisible="False" />
                                                            </Grid>
                                                        </Border>
                                                    </Border>
                                                </Border>
                                                <Border x:Name="SelectedBorder"
                      IsHitTestVisible="False"
                      Opacity="0"
                      BorderBrush="{ThemeResource ListViewItemSelectedBackgroundThemeBrush}"
                      BorderThickness="{ThemeResource GridViewItemMultiselectBorderThickness}">
                                                    <Grid x:Name="SelectedCheckMark"
                      Opacity="0"
                      Height="34"
                      Width="34"
                      HorizontalAlignment="Right"
                      VerticalAlignment="Top">
                                                        <Path x:Name="SelectedEarmark" Data="M0,0 L40,40 z"
                        Fill="{ThemeResource ListViewItemSelectedBackgroundThemeBrush}"
                        Stretch="Fill" />
                                                        <Path x:Name="SelectedGlyph"
                        Data="M0,123 L39,93 L124,164 L256,18 L295,49 L124,240 z"
                        Fill="{ThemeResource ListViewItemCheckThemeBrush}"
                        Height="14.5"
                        Stretch="Fill"
                        Width="17"
                        HorizontalAlignment="Right"
                        Margin="0,1,0"
                        VerticalAlignment="Top"
                        FlowDirection="LeftToRight" />
                                                    </Grid>
                                                </Border>
                                            </Grid>
                                        </Border>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>

                    </ListView.ItemContainerStyle>
                    <ListView.Footer>
                        <Border Height="{ThemeResource ListPickerFlyoutFooterThemeHeight}" Width="1" />
                    </ListView.Footer>                     
                </ListView>
            </DataTemplate>

当我选择一些项目时,它不会去选择的视觉状态,它实际上转到突出显示的视觉状态,当我关闭虚拟化以前的突出显示状态不会被保留

<DataTemplate x:Key="ListPickerFlyoutPresenterContentTemplate">
    <ListView ItemContainerStyle="{StaticResource ListPickerFlyoutPresenterItemStyle}">
       <ListView.ItemsPanel>
           <ItemsPanelTemplate>
                <ItemsStackPanel  CacheLength="10" />
            </ItemsPanelTemplate>
        </ListView.ItemsPanel>

        <ListView.Footer>
            <Border Height="{ThemeResource ListPickerFlyoutFooterThemeHeight}"
                    Width="1" />
        </ListView.Footer>
    </ListView>
</DataTemplate>