title: R File missing on library dependent project
body: <p>I am trying to use jfeinstein10 / SlidingMenu <a href="http://goo.gl/PEZ9M" rel="nofollow">http://goo.gl/PEZ9M</a> in my android application.First I have added library project of Sliding Menu, then I added ActionBarSherlock too.Sliding Menu library is dependent to ActionBarSherlock.</p>
  
  <p>Also my app is dependent to SlidingMenu app.</p>
  
  <p>My question is that when I add a library project as a dependency to my main project, the R file of the main project disappears and all my R references in main project cannot be resolved.</p>
  
  <p>does anyone know that R file disappearance issue after adding a library project as a dependency?</p>