>>> Hi all,
>>> 
>>> I've written a custom view and done some optimisation of the drawing calls 
>>> so only the exact areas that need redrawing are passed to the 
>>> 'setNeedsDisplayInRect' function.
>>> 
>>> All was working well, until I embedded my view into an NSScroller.
>>> 
>>> Since then my custom view seems to be being invalidated by grid sections.
>>> 
>>> I've included a link to some pics to try and better show.
>>> 
>>> http://www.flickr.com/photos/47616...@n08/sets/72157623505127258/
>>> 
>>> I added the green borders around the dirtyRect area to better show the 
>>> problem.
>>> 
>>> Thanks,
>>> 
>>> Billy.
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