title: Adding Nested Treeview Nodes in VB.NET?
body: <p>I am trying to add some items to a TreeView Control:</p>
  
  <pre><code>    TV1.Nodes.Add("key1", "Test1")  'Works
      TV1.Nodes("key1").Nodes.Add("key2", "Test2") 'Works (Nested)
      TV1.Nodes("key2").Nodes.Add("key3", "Test3") 'Error (NullReferenceException)
  </code></pre>
  
  <p>any ideas? thanks :)</p>