title: Start HorizontalScrollView Animation
body: <p>I want to start HorizontalScrollView animation when I click a button.</p>
  
  <p>When I click a button I see all the HorizontalScrollView at once on the screen, 
  but I want to see the HorizontalScrollView enter to the screen slowly from the right, and I want it to stop after it enter 30% to the screen, 
  and just after I scroll it with my finger, I will see the all HorizontalScrollView.</p>
  
  <p>How can I do this?</p>
  
  <p>Thank's.</p>