title: Adding button that will replace the scroll in listView
body: <p>i want to write some control that will contain 2 button and listView. 
  Pressing button 1 will scroll the listview up. 
  Pressing button 2 will scroll the listview down.</p>
  
  <p>The direct scroll of the listview will be unavailable - ( will be invisible ? ). </p>
  
  <ol>
  <li><p>I  don't find the listview method 'scroll-up'  / 'scroll-down' that i could callon the button event. </p></li>
  <li><p>How can i make the listview scroll to be always visible ? </p></li>
  </ol>
  
  <p>Someone can help me here ? </p>
  
  <p>Thanks.</p>