WinRT XAML - 如何在ListView中水平拉伸按钮

Question

我正在尝试在ListView中水平拉伸按钮，但我的xaml代码不起作用：

        <ListView Grid.Row="2" ItemsSource="{Binding Path=Items}" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <Button Grid.Row="2" Background="White" BorderThickness="4,0,0,1" BorderBrush="#8c0095" Margin="32,-3,32,17" Padding="0" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">

                            <TextBlock Text="{Binding Name}" Foreground="#8c0095" FontSize="20" Margin="15,1,0,10" FontWeight="Medium" />

                    </Button>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

我该如何解决这个问题？