When I scroll around in RadVirtualGrid, I get empty cells in some places. Details: - I set InitialRowCount=21 and InitialColumnCount =17. - The window that contains the VirtualGrid is rather small, so that the horizontal and vertical scrollbars are visible. - I can always reproduce this issue, if I scroll completely to the right, then completely to the bottom and then half-way to the left. - I found out that the CellValueNeeded event is never called with the indexes for these cells. - I'm using version 2017.2.614.45 (NoXaml) of UI for WPF. - I attached a screenshot showing the empty cells and my example project.