var cellType1 = new GC.Spread.Sheets.CellTypes.CheckBox(); cellType1.caption("caption"); cellType1.textTrue("true"); cellType1.textFalse("false"); cellType1.textIndeterminate("indeterminate"); cellType1.textAlign(GC.Spread.Sheets.CellTypes.CheckBoxTextAlign.bottom); cellType1.isThreeState(true); activeSheet.getCell(1, 1).cellType(cellType1);