There are large number of items for the TreeList (for example 3000) and you have all them initially collapsed. For example you could modify the IsExpandedBinding demo to have 3000 items. Then scroll down so the row with Drinks and Count = 2194 is at the top of the control and expand it. The result is that both that row and the row with Drinks and Count = 2199 expand.
TreeListView is trying to expand its item which is empty.
Expanded TreeListViewRow cannot be collapsed when select a child node and SelectionMode is set to "Expanded". Steps to reproduce: 1. Expand the root node 2. Select a child node 3. Try to collapse the root node
Keyboard navigation stops working when setting SelectionMode to "Extended", SelectionUnit to "Cell" and pressing twice the down keyboard key . The problem should be resolved with version Q1 2016.
Available in LIB version: 2017.2.605
Available in LIB version: 2017.2.522