$(document).ready(function () {
     var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
     var sheet = spread.getActiveSheet();
 //水平グリッド線を非表示にします。
sheet.options.gridline = {color:"red", showVerticalGridline: true, showHorizontalGridline: false};
 spread.invalidateLayout();
 spread.repaint();
 });