title: Is there any way to nest grouping in a listview? Or do I have to use a TreeView?
body: <p>Basically, I have a collection of <code>Foo</code>s.</p>
  
  <pre><code>public class Foo
  {
      public string Section { get; set; }
      public string SubSection { get; set; }
  
      public string item { get; set; }
  }
  </code></pre>
  
  <p>I want my Foo's to be grouped by Section, then by SubSection.</p>
  
  <pre><code>Section A
   Section A1
    - Item A1.0
    - Item A1.1
   Section A2
    - Item A2.0
    - Item A2.1
    - Item A2.2
  Section B
  ... etc
  </code></pre>