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Displaying images in an outline view

Dear list,
I'm trying to display an image inside an outline view. I guess it is
possible since from in the developer docs I found the following
encouraging statement:

"The data cell for the column values is typically an instance of
NSTextFieldCell, but can be an instance of any NSCell subclass, such as
NSImageCell. "

Actually the docs are talking about NSTableView, but since the former
is a subclass of the latter I guessed that they apply to NSOutlineView
too.

I'm actually without any clue. I tried by returning an NSImage and an
NSImageCell in the

- (id)outlineView:(NSOutlineView *)outlineView
objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item;

but without any luck. The only effect is to display the string returned
by the description method of those objects.

Any suggestion?

Thanks in advance,
Roberto Esposito
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