Command button remains disabled after a request redirect to a PDF Servlet

Question

Hi All,
I've a command button to generate PDF on the fly and used to work in JDev 10.1.3.3.
When we migrated to 11g, it works for the first time on a page, and the file Open/Save dialog will come up.
But then the command button remains grayed out, and clicking doesn't generate a server call.
If I do something on the page which does a partial or full submit, then the button will get enabled again.
Any suggestions?
Thanks,
Jaimon
Sample code:
Facelets:
<af:commandButton text="Create PDF" action="#{fs02.createPDF}" />
Java:
public String createPDF() {
//Validation checks here. If there are any errors, it gets added to FacesMessages to display on the same page.
if(!validate()) {
//sf.addInfoMessage('message here..');
}else {
FacesContext ctx = FacesContext.getCurrentInstance();
HttpServletRequest request = (HttpServletRequest)ctx.getExternalContext().getRequest();
HttpServletResponse response = (HttpServletResponse)ctx.getExternalContext().getResponse();
RequestDispatcher rd = request.getRequestDispatcher("/pdfdownloader");
rd.forward(request, response);
ctx.responseComplete();
return null;
pdfdownloader is mapped as a servlet, which writes the actual PDF content as a stream.

Answer 1

Herewith the code which is triggered with the post-forms-commit trg. As far as I can see it, there is no code to disable/enable the save button in the menubar.
===
PROCEDURE validate_enbr_records IS
CURSOR c_enbr
IS
SELECT exlb.exlb_length
, enbr.enbr_ind_break
FROM dog_envelop_breaks enbr
, dog_extrnl_labels exlb
WHERE enbr_appl_cod = :flow_appl_cod
AND enbr_flow_cod = :flow_cod
AND enbr_sort_seqnr <> :enbr_sort_seqnr
AND enbr_appl_cod = exlb_appl_cod
AND enbr_exlb_cod = exlb_cod;
CURSOR c_exlb
IS
SELECT exlb_length
FROM dog_extrnl_labels
WHERE exlb_appl_cod = :flow_appl_cod
AND exlb_cod = :enbr_exlb_cod;
l_lengte_break_label NUMBER := 0;
l_lengte_sort_label NUMBER := 0;
l_length NUMBER := 0;
l_aant NUMBER := 0;
r_enbr c_enbr%ROWTYPE;
mi_id MenuItem;
BEGIN
FOR r_enbr in c_enbr LOOP
IF r_enbr.enbr_ind_break = 'Y'
THEN
l_lengte_break_label := l_lengte_break_label + r_enbr.exlb_length;
ELSE
l_lengte_sort_label := l_lengte_sort_label + r_enbr.exlb_length;
END IF;
l_aant := l_aant + 1;
END LOOP;
OPEN c_exlb;
FETCH c_exlb INTO l_length;
CLOSE c_exlb;
IF :enbr_ind_break = 'Y' THEN
l_lengte_break_label := l_lengte_break_label + l_length;
ELSE
l_lengte_sort_label := l_lengte_sort_label + l_length;
END IF;
IF l_lengte_break_label > 48
THEN
qms$errors.show_message('DOG-10194');
END IF;
IF l_lengte_sort_label > 50
THEN
qms$errors.show_message('DOG-10195');
--set_record_property(3,'enbr',status,changed_status);
END IF;
IF :system.record_status = 'CHANGED' THEN
set_menu_item_property('FILE_MENU.SAVE',ENABLED,'YES');
END IF;
END;
===
After the message has been throughn and the OK-button has been clicked, the code is never reaching the code:
IF :system.record_status = 'CHANGED' THEN
set_menu_item_property('FILE_MENU.SAVE',ENABLED,'YES');
END IF;
The save-button remains disabled.
Best regards
John.