title: Expand ListView item with animation
body: <p>I have a <code>ListView</code>. Initially, the <code>ListView</code> contains some data. When the user clicks on an item, another layout will be dynamically added to that item so it's height will be increased.</p>
  
  <p>Right now, when the item's height is increased, it shows the modified item instantly. However, what I want is for this to be animated so it increases the item's height gradually.</p>