var selectedID = [];

myDataTable.subscribe("checkboxClickEvent", function(oArgs){
                alert("check box clicked");
                var elCheckbox = oArgs.target;
                var oRecord = this.getRecord(elCheckbox);
                if (elCheckbox.checked) {
                    selectedID.push(oRecord.getData("id"));
                }
                else {
                    selectedID.pop(oRecord.getData("id"));
                }
                oRecord.setData("check",elCheckbox.checked);
            });