title: XCode does not add c++ source files that are in subdirectories into Compile Sources
body: <p>I use XCode 5.1 for C++ development. I have existing code which I add to the project by dragging files from Finder. The project shows all necessary <code>.h</code> and <code>.cpp</code> files. But when I click <code>Build Phases-&gt;Compile Sources</code>, I only see sources that from the root directory in my source structure. None of the source files from subdirectories appear in the Compile Sources. Why? And how to fix this?</p>
  
  <p>Also, when I try to add the missing <code>.cpp</code> file from <code>Build Phases-&gt;Compile Sources</code> by pressing <code>+</code>, XCode does not expand the subdirectories, so I cannot select the missing <code>.cpp</code> files.</p>