title: WPF ListBox's scrollviewer customizable so that there is no Scrollbar, only RepeatButtons
body: <p>I would like to customize the scrollbars of a listbox's scrollviewer in such a way that the scrollbar only consists of a RepeatButton for scrolling up and a Repeatbutton for scrolling down. Nothing else. There should be no scrollbar (track) between the buttons.
  One button should be to the left of the ItemsPanel (scroll up) and the other on the right of the ItemsPanel.</p>
  
  <p>Is that possible?</p>