KVO Code Breaks Undo

I have core data document based application with a custom opengl layer- hosting view. Everything works except when objects are added or removed from the managed object model the view is not redrawn. So I add the following to code to redraw the view but then automatic undo is broken.

// Receive KVO change notifications if objects are added to or removed
// from the array so we can redraw the display. !!!: Breaks undo!
- (void)awakeFromNib
[observableController addObserver:self forKeyPath:@"arrangedObjects" options:NSKeyValueObservingOptionNew context:NULL];

// Respond to KVO change notifications. !!!: Breaks undo!
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
[graphicsLayer setNeedsDisplay];

Any ideas as to why undo stopped working?



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