title: auto scroll to the bottom of container in sencha touch 2
body: <p>I have a view that contains 2 parts:
   + Part 1: an ADD button
   + Part 2: a container LIST that has scroll attribute is auto.</p>
  
  <p>When user clicks on button ADD, the system will add a container to container LIST. User can add as much as they want.</p>
  
  <p>But my container LIST has limit height so I want to scroll to new container that added to container LIST when user clicks ADD button.
  Anyone help me. Thanks</p>