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datagrid.SelectedDetailsViewGrid.SelectedItems returns NULL when a line is selected with the mouse right-button (for context menu). The control worked correctly until package version 18.4.0.49. From version 19.1.0.54 ahead is mandatory to first select the line with mouse left-button and then use the right-button to make sure that the item is correctly selected.
Attached is a file with screenshots where is easy to see the missing column cursor when the line is selected but the details grid is not.