Hi there,
sorry for being rather terse these days, I am conscious I tend to tap too much 
and help too few.

Small question: I have a NSArrayController managing a Core data entity array. I 
want to alter the selection via -setSelectionIndex, and it fails (the index 
won't change). The documentation is (also) rather terse on the possible causes 
for such a failure – I do no edition, I just want to pick up an entity through 
a dialog. Does someone have a little experience with these cases? Especially, 
how to dig up to the point responsible for the denial?

Thanks a lot,
Vincent

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