You can select the records of the Master-DetailsView programmatically at run time by setting the corresponding child grid row index to the SfDataGrid.SelectedIndex property. This can be achieved by passing the row index of both the parent and child grids. Before setting the SelectedIndex to child grid, you need to check whether the corresponding parent record is in the expanded or collapsed state. When it is expanded, you can directly select the records of the child grid; otherwise, you need to expand it manually by using the SfDataGrid.ExpandDetailsViewAt helper method. You can also bring the corresponding DetailsView grid into the view by using the DetailsViewManager.BringToView helper method. This is demonstrated in the following code example.
Note: You can get the DetailsViewDataGrid by passing the corresponding rowindex and different relation name when the DetailsView has more than one level.
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