import progress

TestArea.tscn

@@ -0,0 +1,57 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://ControlTree.tscn" type="PackedScene" id=1]
+
+[sub_resource type="GDScript" id=1]
+script/source = "extends Control
+
+var i
+var j
+
+func _ready() -> void:
+	pass
+
+
+func _on_Button_pressed() -> void:
+	i = $ControlTree.add_item('test')
+
+
+func _on_Button2_pressed() -> void:
+	j = $ControlTree.add_item('test2', i)
+
+
+func _on_Button3_pressed() -> void:
+	$ControlTree.add_item('test3', j)
+"
+
+[node name="TestArea" type="Control"]
+anchor_right = 1.0
+anchor_bottom = 1.0
+script = SubResource( 1 )
+
+[node name="ControlTree" parent="." instance=ExtResource( 1 )]
+
+[node name="Button" type="Button" parent="."]
+margin_left = 634.0
+margin_top = 48.0
+margin_right = 765.0
+margin_bottom = 97.0
+text = "Add item"
+
+[node name="Button2" type="Button" parent="."]
+margin_left = 634.0
+margin_top = 117.0
+margin_right = 765.0
+margin_bottom = 166.0
+text = "Add subitem"
+
+[node name="Button3" type="Button" parent="."]
+margin_left = 634.0
+margin_top = 194.0
+margin_right = 765.0
+margin_bottom = 243.0
+text = "Add subsubitem"
+
+[connection signal="pressed" from="Button" to="." method="_on_Button_pressed"]
+[connection signal="pressed" from="Button2" to="." method="_on_Button2_pressed"]
+[connection signal="pressed" from="Button3" to="." method="_on_Button3_pressed"]