title: Android Jelly Bean More Option Button
body: <p>I use Galaxy Nexus and it hasn't any button. But others have some special buttons. For example home,menu,back and search. I am developing an android app and for example I want to use menu button. How can I do this ? How can I add one or more keys on bottom line ?</p>
  
  <p>For example Whatsapp using this. I start whatsapp and I see 4 button, back, home, apps and consecutive three-point. If I click this three-point button , new tab opened and there are few options here. </p>
  
  <p>I want to use this logic how can I do this ? </p>
  
  <p>Note: I don't know how can I pronounced these buttons name.</p>