title: How to show next n items using WPF ListBox or ScrollView?
body: <p>I have list box with 10 items. 
  By default vertical scroll is enabled and i can see first 3 items. 
  Customer wants me to add 2 buttons "UP" and "down" and on a button click list box should show next 3 items.</p>
  
  <p>For example i want to show by "down" click item 4,item 5, item 6.</p>
  
  <p><img src="https://i.stack.imgur.com/hNlRD.png" alt="enter image description here"></p>
  
  <p>How its possible to do with default WPF controls listbox and scrollview?</p>