On Sun, Jun 8, 2008 at 1:37 PM, Joan Lluch (casa) <[EMAIL PROTECTED]> wrote:
>    return ( item && [[item representedObject] isKindOfClass:[GroupNode
> class]] ) ;

Style note: you don't need to do this.  [[item representedObject]
isKindOfClass:[GroupNode class]] will work just fine, because messages
to nil return zero or their logical equivalent.  So if item == nil,
then [item representedObject] == nil, which means that [[item
representedObject] isKindOfClass:[GroupNode class]] == NO.

Of course, this all works only if the GroupNode class exists.  ;-)

--Kyle Sluder
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