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I've got SfDataGrid with SelectionMode set to GridSelectionMode.Multiple and added selector column:
sfdg.Columns.Add(new GridCheckBoxSelectorColumn() { MappingName = "SelectorColumn", HeaderText = string.Empty, AllowCheckBoxOnHeader = true, Width = 34, CheckBoxSize = new Size(14, 14) });
When there is no selected rows in selector column and user is pressing arrow up/arrow down key using keyboard, focus is moved up/down and first focused row is automatically selected (which should not happen - it should move selector up or down without selecting any rows).