WPF 中获取DataGrid 模板列中控件的对像

  #region 当前选定行的TextBox获得焦点
        /// <summary>
        /// 当前选定行的TextBox获得焦点
        /// </summary>
        public void SelectedRowTBFocus()
        {
            if (SelectIndex != -1)
            {
                FrameworkElement item = grid.Columns[6].GetCellContent(grid.Items[SelectIndex]);
                DataGridTemplateColumn temp = (grid.Columns[6] as DataGridTemplateColumn);
                SelectTB = temp.CellTemplate.FindName("FinCode", item) as TextBox;
                SelectTB.Focus();
            }
        }
        #endregion