title: Adding a reference to a library project
body: <p>I have a problem when I want to add a reference to google-play-services_lib of my Android project with Eclipse. 
  I followed the steps described here on developer.android.com and it seems to work when i do the add because i have this icon : <img src="https://i.stack.imgur.com/mOOIB.png" alt="http://cyberterry.fr/pb_library2.png"></p>
  
  <p>But after, when i click on apply/ok and i close this window, if i re-opens the same window i have this icon :</p>
  
  <p><img src="https://i.stack.imgur.com/4Uyoi.png" alt="enter image description here"></p>
  
  <p>I don't understand.. </p>
  
  <p>Thanks for your help.</p>