On 14 Oct 2011, at 00:21, Quincey Morris wrote:

> On Oct 13, 2011, at 13:44 , Luc Van Bogaert wrote:
> 
> Use a NSIndexSet property instead of a NSMutableIndexSet, and change the 
> property by assigning it a new (immutable) index set -- that is, via the 
> setter.
> 


This works! Thanks for your help.

-- 
Luc Van Bogaert.
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