GrapeCity.Win.Spread.InputMan.CellType.GcComboBoxCellType gccombo = new GrapeCity.Win.Spread.InputMan.CellType.GcComboBoxCellType();
gccombo.Items.AddRange(new string[] { "Feta", "Havarti", "Swiss" });
gccombo.Items[0].BackColor = Color.Beige;
gccombo.Items[1].BackColor = Color.Cornsilk;
gccombo.Items[2].BackColor = Color.PeachPuff;
GrapeCity.Win.Spread.InputMan.CellType.SideButtonInfo testbutton1 = new GrapeCity.Win.Spread.InputMan.CellType.SideButtonInfo();
testbutton1.BackColor = Color.Green;
testbutton1.UseVisualStyleBackColor = false;
testbutton1.Behavior = GrapeCity.Win.Spread.InputMan.CellType.SideButtonBehavior.SpinUp;
gccombo.SideButtons.Add(testbutton1);
fpSpread1.Sheets[0].Cells[1, 1].CellType = gccombo;
fpSpread1.Sheets[0].Columns[1].Width = 200;
fpSpread1.Sheets[0].Rows[1].Height = 40;