如何选择DataGrid SelectionMode =“Extended”SelectionUnit =“Cell”Binded to DataTable

I only seem to be able to find solutions with ObservableCollections and autogenerate columns, but i dont have a fixed amount of columns. And that is why I use a DataTable for binding to the DataGrid. I Dunno if its possible to make make a nested collection binding somewhat like this:I only seem to be able to find solutions with O