[C#]
  public class AdvDropDownListColumn : DropDownListColumn
  {
    public AdvDropDownListColumn(string caption) : base(caption){}

    private bool showDropDownButtons = false;
    
    [DefaultValue(false)]
    public bool ShowDropDownButtons
    {
      get
      {
        return showDropDownButtons;
      }
      set
      {
        if (showDropDownButtons != value)
        {
          showDropDownButtons = value;
          base.OnChanged(InvalidationMode.ColumnWithoutHeader, false);
        }
      }
    }
    
    public override Rectangle GetEditableCellRect(FlyGridViewPort context, FlyGridViewPort grid, NodeBase node)
    {
      Rectangle er = base.GetEditableCellRect (context, grid, node);
      if (showDropDownButtons)
        er.Width -= SystemInformation.VerticalScrollBarWidth;        
      return er;
    }

    public override void PaintCell(CellDrawInfo dci)
    {
      Rectangle buttonRect = dci.cellRect;
      if (showDropDownButtons)
      {
        dci.cellRect.Width -= SystemInformation.VerticalScrollBarWidth;        
      }
      base.PaintCell (dci);
      if (showDropDownButtons)
      {
        buttonRect = new Rectangle(buttonRect.Right - SystemInformation.VerticalScrollBarWidth, buttonRect.Y, SystemInformation.VerticalScrollBarWidth, buttonRect.Height);
        ControlPaint.DrawComboButton(dci.g, buttonRect, ButtonState.Normal);
      }
    }
  }