class TestViewModel2
	{
		public string[] ItemsForCombo { get; set; }

		public ObservableCollection<SomeItem> ItemsForList { get; set; }
	}

	class SomeItem
	{
		public string Name { get; set; }
		public int Volume { get; set; }
		public int SelectedIndex { get; set; }
	}

		<ListBox ItemsSource="{Binding ItemsForList}">
			<ListBox.ItemTemplate>
				<HierarchicalDataTemplate DataType="controls:SeriaAttr">
					<StackPanel>
						<Label Content="{Binding Name}" />
						<Label Content="{Binding Volume}" />
						<ComboBox ItemsSource="{Binding ???}" SelectedIndex="{Binding SelectedIndex}" />
					</StackPanel>
				</HierarchicalDataTemplate>
			</ListBox.ItemTemplate>
		</ListBox>

		<ListBox HorizontalContentAlignment="Stretch" ItemsSource="{Binding ItemsForList}">
			<ListBox.ItemTemplate>
				<DataTemplate>
					<ComboBox ItemsSource="{Binding Path=ItemsForCombo, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}" SelectedIndex="{Binding SelectedIndex}" />
				</DataTemplate>
			</ListBox.ItemTemplate>
		</ListBox>

	public partial class Window3 : Window
	{
		public Window3()
		{
			InitializeComponent();
		}

		public string[] ItemsForCombo
		{
			get
			{
				return (this.DataContext as TestViewModel3).ItemsForCombo;
			}
		}
	}