查找DataGrid某个单元格中的控件

/// <summary>
        /// 查找DataGrid某个单元格中的控件
        /// </summary>
        /// <param name="myDataGrid">DataGrid名称</param>
        /// <param name="columnIndex"></param>
        /// <param name="rowIndex"></param>
        /// <param name="controlName">要查找的控件名称</param>
        /// <returns></returns>
        public object FindName(System.Windows.Controls.DataGrid myDataGrid, int columnIndex, int rowIndex, string controlName)
        {
            FrameworkElement item = myDataGrid.Columns[columnIndex].GetCellContent(myDataGrid.Items[rowIndex]);
            DataGridTemplateColumn temp = (myDataGrid.Columns[columnIndex] as DataGridTemplateColumn);
            return temp.CellTemplate.FindName(controlName, item);
        }