title: How to drag listitem on another listitem and make it expandable list?
body: <p><a href="https://i.stack.imgur.com/YZ0nZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YZ0nZ.png" alt="enter image description here" /></a>I have a task of dragable listview but requirement is little bit change, i have  a listview which is dragable but i need some customization that if i drag a listitem on another listitem it will create a expandable view for example:</p>
  <p><strong>Listitem1</strong> drag on <strong>Listitem2</strong></p>
  <p>now <strong>listitem2</strong> will become the <strong>expandable listview</strong> but this <strong>expandable listview</strong> has also dragable listitems in it. Please note that everything in the list is dragable.</p>
  <p>can anybody tell me how can i achieve this task?</p>