将DataGridComboBoxCollumn绑定到我的ViewModel中的IObservableCollection

private IObservableCollection<string> _comboBoxItems;
public IObservableCollection<string> ComboBoxItems
{
    get { return _comboBoxItems; }
    set { _comboBoxItems = value; OnPropertyChanged(); }
}

<DataGridComboBoxColumn Header="ComboBox Column" SelectedItemBinding="{Binding SelectedItem}">
    <DataGridComboBoxColumn.ItemsSource>
        <Binding Path="ComboBoxItems" />
    </DataGridComboBoxColumn.ItemsSource>
</DataGridComboBoxColumn>

ComboBoxItems = new ObservableCollection<string>();
ComboBoxItems.Add("Option 1");
ComboBoxItems.Add("Option 2");
ComboBoxItems.Add("Option 3");

private string _selectedItem;
public string SelectedItem
{
    get { return _selectedItem; }
    set { _selectedItem = value; OnPropertyChanged(); }
}