var type = new GC.Spread.Sheets.Style();
type.watermark = "User name";
type.cellPadding = "20";
type.labelOptions = {alignment:GC.Spread.Sheets.LabelAlignment.topLeft, visibility: GC.Spread.Sheets.LabelVisibility.visible};
activeSheet.setStyle(0, 1, type);
activeSheet.getRange(0, -1, 1, -1, GC.Spread.Sheets.SheetArea.viewport).height(60);
activeSheet.getRange(-1, 1, -1, 1).width(150);

var combo = new GC.Spread.Sheets.CellTypes.ComboBox();
combo.items([{ text: "Oranges", value: "11k" }, { text: "Apples", value: "15k" }, { text: "Grape", value: "100k" }]);
combo.editorValueType(GC.Spread.Sheets.CellTypes.EditorValueType.text);
activeSheet.setCellType(2, 1, combo, GC.Spread.Sheets.SheetArea.viewport);
activeSheet.getCell(2, 1, GC.Spread.Sheets.SheetArea.viewport).watermark("ComboBox Cell Type").cellPadding('10 10 20 10');
activeSheet.getCell(2, 1, GC.Spread.Sheets.SheetArea.viewport).labelOptions({alignment: GC.Spread.Sheets.LabelAlignment.bottomCenter, foreColor: 'yellowgreen', font: 'bold 15px Arial'});
activeSheet.getRange(2, -1, 1, -1, GC.Spread.Sheets.SheetArea.viewport).height(60);