Setting sample rate to 22 kHz

Hi All,
Im trying to create a 48kbits/22kHz mp3 mixdown/bounce of my project in logic express 7.2.3. Has to be 22 kHz to play in flash player on website. The bit rate is no problem as its a setting in mp3 bounce.
Problem is when i go to select from Audio > Sample Rate i dont get 22 kHz as a sample rate, only 44kHz upwards
Ive searched manual and forums but cant seem to find an answer on how to do this. Also most 3rd party conversion software ive come across doesnt allow resampling, only rate conversion. I know i can do it in another editor, eg audacity, but i would prefer to do it all in the one program.
Can anyone help me on how to set up a 22 kHz / 48 kbits mp3 bounce?
Thanks

Thanks Noeqplease,
That really is a pity. Audacity will just have to do it for now, and i might see if i can do most of my editing in that. Pity given logic expresses capabilities.
Appreciate the quick reply

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