We need an API through which we can get the currently visible in the viewport items. The API should take into account operations like sorting, filtering and grouping.

When ListenForNestedPropertyChange is true and scrolling or resizing the window, the InvalidOperationException occurs. 

When using cell editor template and editing the cell, and at some point exits the view port, to start editing another cell this makes the content of the previous cell to disappear.

When having a DataGrid with DataPager and going on the second page, the DataGrid keyboard navigation does not work as expected. The keyboard navigation works only on the first page.