WPF gets the control in the datagridtemplatecolumn of the specified row and column in the DataGrid

        /// <summary>
        ///  Get controls 
        /// </summary>
        /// <param name="control_name"> Control name </param>
        /// <param name="row"> That's ok </param>
        /// <param name="col"> Column </param>
        private void setStar(string control_name, int row, int col = 4)
        {
            DataGridTemplateColumn templeColumn = grd_fan.Columns[col] as DataGridTemplateColumn;
            FrameworkElement s = grd_fan.Columns[col].GetCellContent(grd_fan.Items[row]);
            Button tbOper = templeColumn.CellTemplate.FindName(control_name, s) as Button;
            tbOper.Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#ffc400"));
        }