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removing item from NSTreeController or NSOutlineView

I've been looking at the SourceView sample code and was wondering how I would create a custom remove method. For example, I don't want to remove certain nodes, so what I want to do is check if the node isSpecialGroup (a node that should not be removed) and remove the node if it is not. I'm not sure if I need to remove this from the Tree Controller or the outlineView or both. I started doing something like the method below, but I'm pretty sure I'm way off, any help would be much appreciated!

// -------------------------------------------------------------------------------
// remove:
// -------------------------------------------------------------------------------
- (void)remove:(id)sender
{
NSArray *selectedItems = [treeController selectedObjects];
int i;

for (i=0; i<[selectedItems count];i++){
if([self isSpecialGroup [selectedItems objectAtIndex:i]] == YES){
[treeController remove:sender];
}
}

}

Thanks,
Steven

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