如何在xaml中单独对ListView中的项进行分组

<Page.Resources>
    <CollectionViewSource x:Key="GroupedItems" IsSourceGrouped="True" Source="{Binding Items}" />
</Page.Resources>

<ListView ItemsSource="{Binding Source={StaticResource GroupedItems}}"
          ItemsPath="GroupedItems">
    <!-- ListView的其他设置 -->
</ListView>

<ListView.GroupStyle>
    <GroupStyle>
        <GroupStyle.HeaderTemplate>
            <DataTemplate>
                <!-- 显示分组标题的UI元素 -->
            </DataTemplate>
        </GroupStyle.HeaderTemplate>
    </GroupStyle>
</ListView.GroupStyle>

public class Item
{
    public string Name { get; set; }
    public string Group { get; set; }
}

public class ViewModel
{
    public ObservableCollection<Item> Items { get; set; }

    public ViewModel()
    {
        Items = new ObservableCollection<Item>
        {
            new Item { Name = "Item 1", Group = "Group 1" },
            new Item { Name = "Item 2", Group = "Group 1" },
            new Item { Name = "Item 3", Group = "Group 2" },
            new Item { Name = "Item 4", Group = "Group 2" }
        };
    }
}