>I have installed these controls http://www.componentfactory.com/free-windows-forms-controls.php
>
>They appear in the toolbox. How do I subclass the KryptonHeaderGroupControl? I would like to create a base level control based on it, then subclass it some more, but I don't know how to make a subclass.

   using KryptonHeaderGroup...

   public class MyKryptonControl : KryptonHeaderGroupControl
   {
      public MyKryptonControl ()
      {
      }
   }