Erase functions on Disk Utility in Lion

Having installed Lion on my MacBook Air I find the erase functions on Disk Utility are no longer available. Any ideas?

Michael Superczynski wrote:
http://support.apple.com/kb/ht1533
Thank you for the link Michael.
I'm still wondering why I can't erase or partition my disk.
It works fine in SL on my MacBook Pro Unibody (late 2008). It even works on my old white MacBook from 2005 which I upgraded to the OS X Lion.

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