How to make gthumb the default photo importer in F16

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http://forums.fedoraforum.org – Under F15, when inserting media with photos, I got to choose which application to use to import the photos. gthumb always worked for me and I want to continue to use it. F16 gives me no options except to run shotwell or eject the media. How can I make gthumb run when I insert photo media? I can't see any way of configuring this. (HowTos)