title: How to disable transparency for the project navigator?
body: <p>I've updated to OSX Yosemite and see that one of the new "features" of Xcode is blur/transparency effect for the project navigator window. Below is an example of my wallpaper blurring through. I find this to be really fugly and distracting.</p>
  
  <p><strong>Is there a way to disable this blur effect and get a flat/opaque Xcode 6 window?</strong></p>
  
  <p><img src="https://i.stack.imgur.com/hSGF0.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/EssIL.png" alt="enter image description here"></p>