Trouble to set up Time Machine to Airdisk

I bought an airport extreme base station and would like to use time machine to back up my system to airdisk. However I failed to set it up.
I start with System Preference. Here is what I experenced: I mounted the airdisk. Clicked the "Choose Backup Disk..." button. My airdisk did show up. But when I select it and click the "Use for Backup" button. Nothing happened. I still have the "choose backup disk..." button.
In fact the above process works on my macbook, but fails on my Macbook Pro. I wonder whether some people can help me out. Thanks.

It may depend on the different OS X version you may have on your Macs. With 10.5.5 I can select my air disks as backup volumes.
Regards
Peter

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