wp8 界面设计有关问题

<phone:Pivot Title="AAAAA">
            <!--枢轴项一-->
            <phone:PivotItem Header="11111">
                <!--具有文字环绕的双线列表-->
                <phone:LongListSelector Margin="0,0,-12,0" ItemsSource="{Binding Items}">
                    <phone:LongListSelector.ItemTemplate>
                        <DataTemplate>
                            <StackPanel Margin="0,0,0,17">
                                <TextBlock Text="{Binding LineOne}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                                <TextBlock Text="{Binding LineTwo}" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
                            </StackPanel>
                        </DataTemplate>
                    </phone:LongListSelector.ItemTemplate>
                </phone:LongListSelector>
            </phone:PivotItem>

            <!--枢轴项二-->
            <phone:PivotItem Header="22222">
                <!--无文字环绕的双线列表-->
                <phone:LongListSelector Margin="0,0,-12,0" ItemsSource="{Binding Items}">
                    <phone:LongListSelector.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Margin="0,0,0,17">
                                    <TextBlock Text="{Binding LineOne}" TextWrapping="NoWrap" Margin="12,0,0,0" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                                    <TextBlock Text="{Binding LineThree}" TextWrapping="NoWrap" Margin="12,-6,0,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
                                </StackPanel>
                            </DataTemplate>
                    </phone:LongListSelector.ItemTemplate>
                </phone:LongListSelector>
            </phone:PivotItem>
        </phone:Pivot>