title: UITableViewCell expand on click
body: <p>Lets say we have a custom UITableViewCell</p>
  
  <p>So whenever I click custom button on cell.. it should expand to the some extent (you can say 40 height more...) and when i click again to the same custom button it should collapse to the previous height.</p>
  
  <p>Developer's please guide me.. how can I achieve this task</p>