public DynamicallyCreatedEditorControl()
{
    InitializeComponent();

    //...
    grid.CellEditor += OnCellEditor;
}

static void OnCellEditor(object sender, GridCellEditableEventArgs e)
{
    //Dropdown menu with string values
    if (e.Cell.Column.Id == "Column 1")
    {
        List<string> collection = new List<string>();
        foreach (Row child in e.Cell.Row.Parent.Children)
        {
            if (child.Dock == RowDockStyle.None)
            {
                string value = (string)child[e.Cell.Column.Id].Value;
                if (!collection.Contains(value))
                {
                    collection.Add(value);
                }
            }
        }

        //Create a custom editor
        e.Editor = new EnumerableEditor(collection, true);
    }

    //Trackbar menu
    else if (e.Cell.Column.Id == "Column 2")
    {
        e.Editor = new TrackBarEditor(0, 1000);
    }
}