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I am trying to get a TreeView to bind my collection so that all groups show nested groups and each group will show entry. How can I use the HierarchicalDataTemplate so that the TreeView will process both SubGroups and Entries collection? Groups show subgroups and entries: Example: Group1 --Entry --Entry Group2 --Group4 ----Group1 ------Entry ------Entry ----Entry ----Entry --Entry --Entry Group3 --Entry --Entry Objects: 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; } } } Test data: 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" });

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