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XamDataTree ActiveNodeChanging, cancelling leaves newActiveNode highlighted

In WPF/17.2, I'm using XamDataTree to select records to edit. When a record is edited, an isDirty flag is set. If user clicks another node in the XamDataTree, I use the ActiveNodeChanging event to cancel the change if the isDirty flag = true. However, upon e.Cancel = true, the e.NewActiveTreeNode remains highlighted, and the OriginalActiveTreeNode is outlined. I would expect e.Cancel would handle this better, but since it does not, I added code to clear the selected items collections, and set NewActiveTreeNode IsSelected = false, and OriginalActiveTreeNode IsSelected = true, and multiple variations on logic, yet none work.

Please describe how to reset the treeView as expected.