Unable to bind data in combo box in datagrid

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.NET3.0

C#

.NET

WPF

DataGridView

I am having a combo box in data grid in WPF. I am unable to bind data. I have used the below code.

<DataGrid Name="grdDetails" Width="578" Height="149" ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Visible" AutoGenerateColumns="False"  MouseRightButtonUp="grdDetails_MouseRightButtonUp" SelectionChanged="grdDetails_SelectionChanged">
<DataGrid.Columns>
<DataGridTemplateColumn Width="80" Header="Country">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
                                    <TextBlock Text="{Binding Country}" ></TextBlock>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                            <DataGridTemplateColumn.CellEditingTemplate>
                                <DataTemplate>
                                    <ComboBox Name="cbCountry" ItemsSource="{Binding Path=CountryList}" SelectedItem="Code" DisplayMemberPath="Code" SelectedValuePath="Code"></ComboBox>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellEditingTemplate>
                        </DataGridTemplateColumn>
                    </DataGrid.Columns>
                </DataGrid>

Code Behind (C#)

List CountryList = new List(); CountryList = refController.GetCountryData(); // this brings the list of Country.

Please advice.