title: Programmatically change selected ListBoxItem
body: <p>Is it possible to change the selected <code>ListBoxItem</code> from Code-Behind in Windows Presentation Foundation?</p>
  
  <p>It's a quite simple task really, I have a <code>Next</code> and <code>Previous</code> button and they represent the next and previous item in the <code>ListBox</code>. But, <code>myListBox.items</code> are of course object representations of what I stored in the <code>ListBox</code>.</p>
  
  <p>So, how would one fetch the <code>ListBoxItem</code> to set the <code>IsSelected</code> property?</p>