电子表格，点击保存按钮，触发宏事件；
创建客户端onRenderReport事件宏，如下：
function main(spreadsheetReport) {
var that = spreadsheetReport.spreadsheetReportWriteBack;
that.__new_doSaveClick= function() { windowAlert(1); this.doSaveClick(); }
that.removeListener(that.elem_btnSave, "click", that.doSaveClick, that);
that.addListener(that.elem_btnSave, "click", that.__new_doSaveClick, that);
}
