title: UITableView add cell Animation
body: <p>Can any one help me out with <code>UITableView</code> animating issue?</p>
  
  <p>By default we have animation for deleting cell and reordering cells in <code>UITableView</code>.</p>
  
  <p>Can we have animated adding cell, if so how to do it.</p>
  
  <p>I have checked out <strong>Three20</strong>, did not not get how <code>twitter</code> has done the table expand animation under <strong>MyProfile>ReTweets</strong>.</p>
  
  <p>Want to try it without <code>Three20 frameowrk,</code> using the existing animation in <code>UITableView</code>.</p>