title: How to generate rdoc-style collapsable code sections?
body: <p>I am creating internal documentation for a C++ project using Doxygen. I am having Doxygen include the source for methods, etc., but this makes the page kind of hard to scan. I'd like it to behave like rdoc and hide the source in a block that is collapsed by default.</p>
  
  <p>I thought that <code>HTML_DYNAMIC_SECTIONS</code> might let me do this, but alas, the changelog says that option only affects diagrams and graphs.</p>
  
  <p>Maybe I could do it by editing the <code>LAYOUT_FILE</code>?</p>
  
  <p>Anyhow, smart people, how can I coerce Doxygen to generate collapsable code sections?</p>