title: Add extra items to a Silverlight 2 Combobox
body: <p>For a Silverlight 2 webapp. I added a combobox. I have an IEnumerable as Itemsource to populate the combobox. Works fine.</p>
  
  <p>But I would like to add an extra item ("please select a....") to the combobox, anyone an idea how this can be done using the Silverlight 2 combobox.</p>
  
  <p>Any more info about using a template for the ComboxboxItems is welcome as well.</p>