list classes by folder/directory using doxygen ?

Question

Hi,

I would like to display all the classes within a given directory (and its subdirectories) from the doxygen generated documentation.

I could use doxygen /addtogroup and other group commands, but I would like to do this without having to add group tags for each classes within a given directory.

the SHOW_DIRECTORIES options does generate a "Directory" tab/panel but it displays all the files for a given directory and not the classes.

How can I do that ?

thanks!