An exception is thrown when Ctrl+RightArrow is pressed and there is no defined child elements for TreeListView
TreeListView is trying to expand its item which is empty.
Posted on:22 Apr 2011 09:45
System.ArgumentNullException also occurs if navigating with normal RightArrow
(without Ctrl-) from a hierarchy leaf node on the left, to normal grid cell on the right,
and the RadTreeList attributes include SelectionUnit="Cell" and SelectionMode="Extended