public void UsageMethod()
{
Composite root = new Composite("root");
root.Add(new Leaf("Branch 1A"));
root.Add(new Leaf("Branch 1B"));
Composite comp = new Composite("Composite X");
comp.Add(new Leaf("Branch 2A"));
comp.Add(new Leaf("Branch 2B"));
root.Add(comp);
root.Add(new Leaf("Branch C"));
Leaf branch = new Leaf("Branch D");
root.Add(branch);
root.Remove(branch);
root.Display(1);
}