Hi, your XamDataTree does not work as expected.

This code doesn't show group2 under group1
---
      ObservableCollection<object> items = new ObservableCollection<object> ();
 
      var g1 = new AttributeGroupItem() {Name = "Level1"};
      var g2 = new AttributeGroupItem() {Name = "Level2"};
 
      
      g1.Items.Add (new AttributeItem () { Name = "L1 Child" });
      g2.Items.Add (new AttributeItem () { Name = "L2 Child" });
 
 
      g1.Items.Add (g2);
 
      items.Add (g1);
 
      this.xamDataTree1.ItemsSource = items;
---
But that code does!
---
      ObservableCollection<object> items = new ObservableCollection<object> ();
 
      var g1 = new AttributeGroupItem() {Name = "Level1"};
      var g2 = new AttributeGroupItem() {Name = "Level2"}; 

      g1.Items.Add (g2);
      
      g1.Items.Add (new AttributeItem () { Name = "L1 Child" });
      g2.Items.Add (new AttributeItem () { Name = "L2 Child" });
 

 
      items.Add (g1);
 
      this.xamDataTree1.ItemsSource = items;

---
My goal is to display Nodes recursively.

Regards
Benjamin