xamarin表单- listview -选择器-不会与listview中的行对齐

<ListView ItemsSource="{Binding Items}">
    <ListView.ItemTemplate>
        <DataTemplate>
            <ViewCell>
                <StackLayout>
                    <Label Text="{Binding Name}" />
                    <Label Text="{Binding Description}" />
                </StackLayout>
                <<ViewCell.View>
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>
                        <Label Grid.Column="0" Text="选择：" />
                        <Picker Grid.Column="1"
                                ItemsSource="{Binding Source={x:Reference listView}, Path=BindingContext.Options}"
                                SelectedIndexChanged="Picker_SelectedIndexChanged">
                            <!-- 设置选择器的样式和行对齐方式 -->
                        </Picker>
                    </Grid>
                </ViewCell.View>
            </ViewCell>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

public partial class MainPage : ContentPage
{
    public List<string> Options { get; set; }

    public MainPage()
    {
        InitializeComponent();

        // 初始化选择器选项
        Options = new List<string> { "Option 1", "Option 2", "Option 3" };

        // 绑定选择器选项到ListView的数据上下文
        BindingContext = this;
    }

    private void Picker_SelectedIndexChanged(object sender, EventArgs e)
    {
        // 处理选择器选项变化的逻辑
    }
}