Listening for changes to the selected panel of a <deck>?

Jim <[email protected]>
Newsgroups gmane.comp.mozilla.devel.xpfe
Message-ID <[email protected]> 
Is there any way to listen to changes to the selected panel of a XUL 
<deck>? I know DOMAttrModified would work, but that's a Bad Thing, so it 
would be nice if there were another way that didn't degrade performance 
so much. Any ideas?

Thanks,
Jim
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