I downloaded the Xamarin.Mac SourceList (NSOutlineView) sample and all I did was populate more "kiosks" to cause the vertical scrollbar to appear. But scrolling down causes the DataCells at the top to scroll into the HeaderCell at the top (see attached). How should I fix this? In fact, in the NSOutlineView with potentially many SourceListItems which could have potentially many contained subitems, what SHOULD the scrolling behavior be? Should the top HeaderCell scroll off as well? Should there be an overall scrollbar for the whole control and then a scrollbar for the subitems?
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