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Had the same problem with my old one as well. Stripped all the plastic off trying to pry it out.
Ended up just removing the whole thing including the base and replacing it all. Base was sub £10 from ebay iirc.
Thread about taking the wheel off:
http://www.cliosport.net/forum/showthread.php?588775-How-to-remove-airbag-steering-wheel-all-stalks-steering-casing-and-squib&highlight=steering
Thread about how the buttons can be taken apart...