WPF TreeView HierarchicalDataTemplate de liaison de l'objet, avec de multiples collections enfant

Je suis en train d'essayer d'obtenir un TreeView pour lier ma collection de sorte que tous les groupes imbriqués groupes et chaque groupe d'entrée.

Comment puis-je utiliser le HierarchicalDataTemplate de sorte que le TreeView traitera à la fois des sous-groupes et les Entrées de collection?

Groupes montrent des sous-groupes et inscriptions:

Example:
Group1
--Entry
--Entry
Group2
--Group4
----Group1
------Entry
------Entry
----Entry
----Entry
--Entry
--Entry
Group3
--Entry
--Entry

Objets:

---

namespace TaskManager.Domain
{
    public class Entry
    {
        public int Key { get; set; }
        public string Name { get; set; }
    }
}

namespace TaskManager.Domain
{
    public class Group
    {
        public int Key { get; set; }
        public string Name { get; set; }

        public IList<Group> SubGroups { get; set; }
        public IList<Entry> Entries { get; set; }
    }
}

Données de Test:

---

namespace DrillDownView
{
public class TestData
{
public IList<Group> Groups = new List<Group>();
public void Load()
{
Group grp1 = new Group() { Key = 1, Name = "Group 1", SubGroups = new List<Group>(), Entries = new List<Entry>() };
Group grp2 = new Group() { Key = 2, Name = "Group 2", SubGroups = new List<Group>(), Entries = new List<Entry>() };
Group grp3 = new Group() { Key = 3, Name = "Group 3", SubGroups = new List<Group>(), Entries = new List<Entry>() };
Group grp4 = new Group() { Key = 4, Name = "Group 4", SubGroups = new List<Group>(), Entries = new List<Entry>() };
//grp1
grp1.Entries.Add(new Entry() { Key=1, Name="Entry number 1" });
grp1.Entries.Add(new Entry() { Key=2, Name="Entry number 2" });
grp1.Entries.Add(new Entry() { Key=3,Name="Entry number 3" });
//grp2
grp2.Entries.Add(new Entry(){ Key=4, Name = "Entry number 4"});
grp2.Entries.Add(new Entry(){ Key=5, Name = "Entry number 5"});
grp2.Entries.Add(new Entry(){ Key=6, Name = "Entry number 6"});
//grp3
grp3.Entries.Add(new Entry(){ Key=7, Name = "Entry number 7"});
grp3.Entries.Add(new Entry(){ Key=8, Name = "Entry number 8"});
grp3.Entries.Add(new Entry(){ Key=9, Name = "Entry number 9"});
//grp4
grp4.Entries.Add(new Entry(){ Key=10, Name = "Entry number 10"});
grp4.Entries.Add(new Entry(){ Key=11, Name = "Entry number 11"});
grp4.Entries.Add(new Entry(){ Key=12, Name = "Entry number 12"});
grp4.SubGroups.Add(grp1);
grp2.SubGroups.Add(grp4);
Groups.Add(grp1);
Groups.Add(grp2);
Groups.Add(grp3);
}
}
}

XAML:

---

<Window x:Class="DrillDownView.Window2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:TaskManager.Domain;assembly=TaskManager.Domain"
Title="Window2" Height="300" Width="300">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TreeView Name="GroupView" Grid.Row="0" Grid.Column="0" ItemsSource="{Binding}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type local:Group}" ItemsSource="{Binding SubGroups}">
<TextBlock Text="{Binding Path=Name}" />
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type local:Entry}" ItemsSource="{Binding Entries}">
<TextBlock Text="{Binding Path=Name}" />
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</Grid>
</Window>

XAML.CS:

---

public partial class Window2 : Window
{
public Window2()
{
InitializeComponent();
LoadView();
}
private void LoadView()
{
TestData data = new TestData();
data.Load();
GroupView.ItemsSource = data.Groups;
}
}