How to set Save and Apply button to disabled

Question

Hi all
i need to disable the save and apply buttons according to some action the user is doing, when the user changes some LOV value the save button should be disabled
the following code i am using is not working to disable the button,
public void processFormRequest(OAPageContext pageContext, OAWebBean webBean) {
String val = "";
String message = "";
int statusVal = 0;
try {
super.processFormRequest(pageContext, webBean);
if ("empPositionChange".equals(pageContext.getParameter(OAWebBeanConstants.EVENT_PARAM))) {
OAMessageChoiceBean rGBean1 = (OAMessageChoiceBean)webBean.findIndexedChildRecursive("Status");
if (rGBean1 != null) {
val = (String)rGBean1.getValue(pageContext);
statusVal = Integer.parseInt(val);
if (statusVal == 1) {
OAApplicationModule am = pageContext.getApplicationModule(webBean);
OAViewObject vo1 = (OAViewObject)am.findViewObject("WOCreateUpdateVO");
vo1.reset();
if (vo1 != null) {
vo1.next();
OARow row = (OARow)vo1.getCurrentRow();
String ReasonCode = (String)row.getAttribute("Attribute1");
//message = message + ReasonCode;
if (ReasonCode == null) {
OASubmitButtonBean savebBean = ((OASubmitButtonBean)webBean.findChildRecursive("Save"));
if (savebBean != null){
savebBean.setDisabled(true);
OASubmitButtonBean applybBean = ((OASubmitButtonBean)webBean.findChildRecursive("Apply"));
if (savebBean != null){
applybBean.setDisabled(true);
catch(Exception exception){
throw new OAException("Error in Staffing Query: "+exception, OAException.ERROR);
please any one had this issue.
any help??
Regards,

Answer 1

i am using this code in the processRequest
public void processRequest(OAPageContext pageContext, OAWebBean webBean){
super.processRequest(pageContext, webBean);
OAMessageChoiceBean mcb = (OAMessageChoiceBean)webBean.findIndexedChildRecursive("Status");
FireAction firePartialAction = new FirePartialAction("empPositionChange");
mcb.setAttributeValue(PRIMARY_CLIENT_ACTION_ATTR,firePartialAction);
as for tracking the error it is giving me nullpointerexecption on the OASubmitButtonBean savebBean = ((OASubmitButtonBean)webBean.findIndexedChildRecursive("Save"));