title: Android: Navigation Drawer SubMenu: How to Collapsible navigation items
body: <p>I have a Navigation Drawer with 10 options
  Option #5 shoudl have another 7 options (like a sub menu) of some sort that is expandable/collapsible </p>
  
  <p>How do I create a "Collapsible navigation items" like it is described <a href="http://developer.android.com/design/patterns/navigation-drawer.html#Content" rel="nofollow noreferrer">here</a>?</p>