Listbox橫向顯示和dataTemplate

<Window x:Class="PhotoData.AddPhotosWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="AddPhotosWindow" Height="600" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="26"/>
            <RowDefinition/>
            <RowDefinition Height="26"/>
        </Grid.RowDefinitions>
        <Button Content="批量添加照片" Width="100" HorizontalAlignment="Left" Margin="5,2"
                Click="AddPhotoes"/>
        <ListBox Grid.Row="1" ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <WrapPanel IsItemsHost="True"/>
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <HierarchicalDataTemplate>
                    <Grid Margin="5">
                        <Grid.RowDefinitions>
                            <RowDefinition/>
                            <RowDefinition Height="26"/>
                        </Grid.RowDefinitions>
                        <Image Stretch="Fill" Width="100" Height="100" Source="{Binding ImageSourcePath}"/>
                        <TextBlock Grid.Row="1" HorizontalAlignment="Center" Text="{Binding PhotoName}"/>
                    </Grid>
                </HierarchicalDataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <Button Grid.Row="2" HorizontalAlignment="Right" Margin="5,2" Height="22" Width="60" Content="保存"
                Click="SavePhotos"/>
    </Grid>
</Window>