a-plus" 
                                    id="btnAdd" 
                                    process="btnAdd"
                                    update="gpDetail"
                                    value="Add"
                                    action="#{gradeController.prepareAdd()}">
                                    <f:ajax render="btnAdd  btnDelete btnSave   lstSelect gpDetail detailFocus" execute="" >
                                    </f:ajax>
                                </p:commandButton>