binding to count method of an NSArray?

FROM : m
DATE : Tue Aug 17 23:47:16 2004

I'm trying to bind an NSTextField such that it displays the number of
items in an NSArray. I already have a table bound to the array and
that's working well. I've tried a number of ways to get at the array's
count, but I'm beginning to think that it's not possible:

2004-08-17 14:45:01.739 norman[5314] An uncaught exception was raised
2004-08-17 14:45:01.739 norman[5314] [<NSCFArray 0x115afc0>
addObserver:forKeyPath:options:context:] is not supported.  Key path:
count
2004-08-17 14:45:01.740 norman[5314] *** Uncaught exception:
<NSInvalidArgumentException> [<NSCFArray 0x115afc0>
addObserver:forKeyPath:options:context:] is not supported.  Key path:
count

Any pointers?

_murat
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