在WPF默认DataGrid中使用Telerik ComboBox作为DataTemple列绑定问题

<DataGrid AutoGenerateColumns="False">
    <!-- 列定义 -->
</DataGrid>

<DataGrid AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridComboBoxColumn Header="ComboBox列" SelectedItemBinding="{Binding PropertyName}">
            <!-- ComboBox列的定义 -->
        </DataGridComboBoxColumn>
        <!-- 其他列的定义 -->
    </DataGrid.Columns>
</DataGrid>

<DataGridComboBoxColumn Header="ComboBox列" SelectedItemBinding="{Binding PropertyName}">
    <DataGridComboBoxColumn.ElementStyle>
        <Style TargetType="ComboBox">
            <Setter Property="ItemsSource" Value="{Binding DataContext.ComboBoxItemsSource, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" />
        </Style>
    </DataGridComboBoxColumn.ElementStyle>
    <DataGridComboBoxColumn.EditingElementStyle>
        <Style TargetType="ComboBox">
            <Setter Property="ItemsSource" Value="{Binding DataContext.ComboBoxItemsSource, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" />
        </Style>
    </DataGridComboBoxColumn.EditingElementStyle>
</DataGridComboBoxColumn>

private ObservableCollection<string> _comboBoxItemsSource;
public ObservableCollection<string> ComboBoxItemsSource
{
    get { return _comboBoxItemsSource; }
    set
    {
        _comboBoxItemsSource = value;
        OnPropertyChanged(nameof(ComboBoxItemsSource));
    }
}

public ViewModel()
{
    ComboBoxItemsSource = new ObservableCollection<string>()
    {
        "Item 1",
        "Item 2",
        "Item 3"
    };
}