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How do I get acccess to my inner datagrid?

void dgReceiveSalesPicking_RowDetailsVisibilityChanged(object sender, Microsoft.Windows.Controls.DataGridRowDetailsEventArgs e)

{

    DataRowView dr = (DataRowView)dgReceiveSalesPicking.SelectedItem;    

    string recOrderId = dr.Row.ItemArray[0].ToString();

    receiveSp.RetrieveData("select receiveid, productCode, orderIdScanner, quantity, pickedQuantity, customerAcc, post    

                            from receiveSalesPicking

                            where orderIdScanner = '"+recOrderId+"'");

    innerDataGrid = e.DetailsElement as Microsoft.Windows.Controls.DataGrid;

    innerDataGrid.ItemsSource = ((IListSource)receiveSp.datatable).GetList();

    innerDataGrid.BeginningEdit += new EventHandler<Microsoft.Windows.Controls.DataGridBeginningEditEventArgs>(innerDataGrid_BeginningEdit);

}

       

this.dgReceiveSalesPicking.RowDetailsVisibilityChanged += new EventHandler<Microsoft.Windows.Controls.DataGridRowDetailsEventArgs>(dgReceiveSalesPicking_RowDetailsVisibilityChanged);