FarPoint.Win.Spread.CellType.ComboBoxCellType cmbocell = new FarPoint.Win.Spread.CellType.ComboBoxCellType();
cmbocell.Items = (new String[] {"January", "February", "March", "April", "May", "June"});
cmbocell.AcceptsArrowKeys = FarPoint.Win.SuperEdit.AcceptsArrowKeys.AllArrows;
cmbocell.AutoSearch = FarPoint.Win.AutoSearch.SingleCharacter;
cmbocell.Editable = true;
cmbocell.ListAlignment = FarPoint.Win.ListAlignment.Left;
cmbocell.ListOffset = 20;
cmbocell.ListWidth = 0;
cmbocell.MaxDrop = 4;
fpSpread1.Sheets[1].Cells[2,2].CellType = cmbocell;