Refresh pl/sql anonymous block via dynamic action?

Greetings again to the community!
Something I must be misunderstanding.
I want to dynamically (ajax) update a select list depending on a page item. Now when you research for operations like this, you get some examples - but which mostly are older and... contain a lot of coding. So I am wondering if this is to be achieved in a simple way using dynamic action.
I have created a testcase here where the html for a select list ist created in a pl/sql anonymous block like that:
begin
for i in (select EMPNO, ENAME from EMP
        where DEPTNO = :P50_DEP_NO or
                 :P50_DEP_NO is null)
      loop
  htp.p('<option value="' || i.EMPNO || '">' || i.ENAME || '</option>');
  end loop;
end;Region header and footer contain the tags for <select id="selEmps"> ... </select>.
When you press [Btn Update Sel], a dynamic action is triggered, that submits :P50_DEP_NO, then refreshes the region with the pl/sql code, so that, after you have enteres another value in :P50_DEP_NO, the select list then shows the employees of that department. Thats the plan, but
Its not working! Can anyone tell me, what I have overlooked here, please?
Thank you and good night for now,
tobi

Hi Marko,
thanks for your hint. I have already tought about that, but im not sure if this is the solution of this particular situation, because the list really should be generated html-code for formating reasons with jQuery UI and further processing. But I have not worked so much with cascading LOVs, so I really should look into it further.
If I dont find a solution there, I'll get back here.
Thanks and so long,
tobi

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    78090                  152111002    152120091050 INTRODUCTION TO COMPUTERS                          AA       
    78089                  152111001    152120091050 CALCULUS I                                         BB       
    78094                  152111010    152120091050 INTRODUCTION TO PROGRAMMING                        BA       
    79000                  152111009    152120091050 EXPOSITORY WRITING                                 CC       
    81888                  152111008    152120091050 CHEMISTRY LAB.                                     CB       
    78832                  152111007    152120081050 CHEMISTRY                                          CB       
    78831                  152111006    152120081050 PHYSICS I LAB                                      BB       
    78090                  152111002    152120081043 INTRODUCTION TO COMPUTERS                          CC       
    81888                  152111008    152120081043 CHEMISTRY LAB.                                     CB       
    78091                  152111003    152120081043 INTRODUCTION TO COMPUTER ENGINEERING I             YT       
    79000                  152111009    152120081043 EXPOSITORY WRITING                                 BB       
    78831                  152111006    152120081043 PHYSICS I LAB                                      BB       
    78832                  152111007    152120081043 CHEMISTRY                                          DD       
    78090                  152111002    152120071038 INTRODUCTION TO COMPUTERS                          BA       
    79000                  152111009    152120071038 EXPOSITORY WRITING                                 CC       
    78094                  152111010    152120071038 INTRODUCTION TO PROGRAMMING                        DC       
    78089           Edited by: esra aktas on 17.May.2011 10:34

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