Adding multiple files to a project

Hi,
I'm using GPS Pro 3.1.0 and I'm having some difficulty adding multiple
files to my project.  I have a folder with 50 or so files (Ada files:
*.adb & *.ads) and I need to add them all to my project file.  When I
point to this folder in the project properties as a "Source Dir", GPS
only pulls in 2 of the files.  It seems like it can not identify the
rest of my files as Ada files!

Does anyone know how I can add these files at once?  Adding over 50
files one-by-one is not much fun!
Thank you,

Marco A.

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Marco Armani
Software Engineer
Thales Canada, Systems Division
Ottawa, Ontario
(613) 723-7000 ext. 2013