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I manually set IsExpandable for the various nodes in my tree in the RowLoaded event based on some criteria that I determine at runtime. When I have EnableRowVirtualization set to True and I scroll to an item that is initially not visible, the IsExpandable property is being set correctly, but the expand/collapse image is NOT being shown next to my row. When I turn OFF EnableRowVirtualization, everything seems to work properly. Anyone else seeing this?