How to create DropDown DataGrid column in WinForms DataGrid (SfDataGrid)?

public Form1()
{
    InitializeComponent();
 
    sfDataGrid.CellRenderers.Add("DropDownDataGrid", new GridDropDownDataGridCellRenderer(this.sfDataGrid));
 
    sfDataGrid.Columns.Add(new GridDropDownDataGridColumn() { MappingName = "ShipCityID", HeaderText = "Ship City", DataSource = new CountryInfoRepository().Cities });
}
 
public class GridDropDownDataGridColumn : GridColumn
{
 
    public GridDropDownDataGridColumn()
    {
        SetCellType("DropDownDataGrid");
    }
 
    public IEnumerable DataSource { get; set; }
}
 
public class GridDropDownDataGridCellRenderer : GridVirtualizingCellRendererBase<ComboDropDown>
{
    SfDataGrid DataGrid { get; set; }
    public GridDropDownDataGridCellRenderer(SfDataGrid dataGrid)
    {
        DataGrid = dataGrid;
    }
    protected override void OnRender(Graphics paint, Rectangle cellRect, string cellValue, CellStyleInfo style, DataColumnBase column, RowColumnIndex rowColumnIndex)
    {
        base.OnRender(paint, cellRect, cellValue, style, column, rowColumnIndex);
    }
 
    
 
    protected override void OnInitializeEditElement(DataColumnBase column, RowColumnIndex rowColumnIndex, ComboDropDown uiElement)
    {
        Rectangle editorRectangle = GetEditorUIElementBounds();
        uiElement.Size = editorRectangle.Size;
        uiElement.Location = editorRectangle.Location;
        uiElement.DropDownWidth = 300;
 
        SfDataGrid dropDownDataGrid = new SfDataGrid()
        {
            DataSource = (column.GridColumn as GridDropDownDataGridColumn).DataSource,
        };
 
        uiElement.PopupControl = dropDownDataGrid;
        uiElement.DropDownStyle = ComboBoxStyle.DropDownList;
 
        this.TableControl.Controls.Add(uiElement);
        uiElement.Focus();
 
        base.OnInitializeEditElement(column, rowColumnIndex, uiElement);
 
        dropDownDataGrid.SelectionChanged += DropDownDataGrid_SelectionChanged;
 
 
    }
 
    private void DropDownDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        this.DataGrid.View.GetPropertyAccessProvider().SetValue(this.DataGrid.SelectedItem, this.DataGrid.CurrentCell.Column.MappingName, (e.AddedItems[0] as ShipCityDetails).ShipCityID);
        (this.DataGrid.CurrentCell.CellRenderer.CurrentCellRendererElement as ComboDropDown).Text = (e.AddedItems[0] as ShipCityDetails).ShipCityID.ToString();
        (this.DataGrid.CurrentCell.CellRenderer.CurrentCellRendererElement as ComboDropDown).DroppedDown = false;
    }
}