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TAdvTreeComboBox
Programmatically add nodes to the TAdvTreeComboBox

This code snippet inserts a new node in the TAdvTreeComboBox and two levels of child nodes:
var
  tn: TTreeNode;
begin
  tn := AdvTreeComboBox1.Treeview.Items.Add(nil,'Item 1');
  tn := AdvTreeComboBox1.Treeview.Items.AddChild(tn,'Sub item 1');
  tn := AdvTreeComboBox1.Treeview.Items.AddChild(tn,'Sub item 1.1 ');
end;