title: Can't configure background image for DMG installation using CMake
body: <p>I am working with CMake 2.8.10.2 on Mac OS X 10.7.5.</p>
  
  <p>I've configured CMake to build a simple application with Xcode that creates an empty window. I then tried to configure CMake to build a DMG installation of the program specifying a background image using:</p>
  
  <p>set(CPACK_DMG_BACKGROUND_IMAGE /path/to/image)</p>
  
  <p>and custom .DS_Store to set windows size and icon placement using:</p>
  
  <p>set(CPACK_DMG_DS_STORE /path/to/DS_Store file)</p>
  
  <p>Xcode will successfully build the application and create the disk image. When I mount the image it comes up with the correct size and icon placement, however the background is always set to white instead of specified background image.</p>
  
  <p>What is needed to get the background to display properly in the disk image?</p>