title: is it possible to have sub menus in the sliding menu?
body: <p>Hi i have implemented a Android sliding menu using navigation drawer with help of WWW.androidhive.info tutorial. </p>
  
  <p>now my question is , is it possible to have sub menus in the sliding menu? </p>
  
  <p>i mean for example assume i have four options in sliding menu "Facebook","twitter","watsup","android".  and my question is , if i press on Facebook a sub menu must come in down, with in that i must have some other options , like "photos","places" etc.. </p>
  
  <p>when i click on Facebook a drop down menu must appear by pushing down the other items(twitter,watsup,android) in the sliding menu. </p>
  
  <p>(i want sub menu should be shown in the same sliding menu. not in a new sliding menu)</p>