如何通过单击DataGridDetailsPresenter避免在ParentDataGrid中选择DataGridRow？

I have a DataGrid (ParentDataGrid) with a DataGridDetailsPresenter. In the DataGridDetailsPresenter I have another DataGrid (ChildDataGrid). If I select a Row in the ChildDataGrid the surrounding DataGridRow of the ParentDataGrid is selected too.I have a DataGrid (ParentDataGrid) with a DataG