WPF DataGrid 模版嵌套DataGrid有关问题

WPF DataGrid 模版嵌套DataGrid问题
DataGrid 模版列嵌套一个DataGrid 怎么获得模版里的 DataGrid 对象
还有就是应该在那个事件里写
我在模版里嵌套的DataGrid里面也添加了模版列 怎么获得模版列里面的控件对象
------解决方案--------------------------------------------------------
下面是我的测试
c#  

public class Stu : INotifyPropertyChanged
    {
        private string _name;
        public string Name {
            get { return _name; }
            set { _name = value;
            OnPropertyChanged("Name");
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged(string info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }

        private List<Stu> _ename;
        public List<Stu> EListName
        {
            get { return _ename; }
            set {
                _ename = value;
                OnPropertyChanged("EListName");
            }
        }

    }

xaml

    <sdk:DataGrid x:Name="dg" HorizontalAlignment="Left" Height="164" Margin="68,56,0,0"
            CellEditEnding="dg_CellEditEnding_1"    AutoGenerateColumns="False"      VerticalAlignment="Top" Width="187">
            <sdk:DataGrid.Columns>
                <sdk:DataGridTemplateColumn  Header="woca"   >
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <sdk:DataGrid x:Name="cellData" ItemsSource="{Binding EListName}">