title: How to set breakpoint in a dependent xcode project
body: <p>i have a XCode project (my main xcode project which has its executable). It has dependencies on a few other projects (under the Project tab in Detail View, there are a few other xcode project that it depends on).</p>
  
  <p>My question is how can I setup breakpoint in the code of the dependent project?</p>
  
  <p>I tried this, but this does not work
  1. open my main xcode project
  2. double click one of the dependent xcode project
  3. in the source directory, find the file I want to break and add a breakpoint (by click at the side of the border of the editor, a blue 'bookmark thing' shows up)
  4. Go back to 'Build and Go', my application does run but it never breaks at the break point I set in #3.</p>
  
  <p>Can someone please help me? I have spent days on this, I can't figure it why.</p>
  
  <p>Thank you.</p>