title: cMake SOURCE_GROUP multiple files?
body: <p>for a VisualStudio project, i'd like cMake to put all files from a specific folder into a specific filter.</p>
  
  <p>I tried:</p>
  
  <pre><code>SOURCE_GROUP(Math FILES 
      ${CMAKE_CURRENT_SOURCE_DIR}/src/Math/*.cpp
      ${CMAKE_CURRENT_SOURCE_DIR}/src/Math/*.h
  )
  </code></pre>
  
  <p>however, this will place only the first found cpp and the first found h file into that filter. the rest of the files in the folder will be placed in the default Filters</p>
  
  <p>How to do it properly?</p>