How to set Lov item property (Action type,event,parameter etc) in PR when page load

Question

Hi gurus
I am new to OAF, First I need to explain my scenerio.
I need to make some field mandatory or non mandatory based on one LOV item (Pick list or message choice list).
for this i extended the controler and apply the changes, but in this case what heppen, It will effect only when i open the list (pop list) and click on more (Available in poplist) and it will open a new form and i select value from that form. But when I open the poplist and select the value from the same list rather going to more option (it does not open new form), then there are no effect. I though the issue with refreshing when selecting value from the same list.
To resolving this issue what i did
1. go to page == > the same LOV
2. Change the Client Action properties (
     Action type  = fireAction
     event          = xxevent
    submit = true.
After doing this when i run the page from my OAF enviroement , every thing is OK. Then I transfer the Controler to Server machine and change the controller and run the same page from the server, it has the same refreshing issue, Then I thought because I did not transfer LOV such properties so this is hepening,
Now I want to initilize such properties in Page load or what I need to do, Please advise me.
Regards,
Haq

Answer 1

Edward,
Thank you for the suggestion! It directly lead to my solution wherein I used CASE statements for the column in my Region SELECT such as the following:
WHEN (:P2_GRADING_METHOD = 'CR/NC' OR scs.scs_pass_audit = 'P') AND GET_GRADE_B93 (sac.stc_final_grade, sac.stc_verified_grade) IS NULL THEN htmldb_item.select_list_from_lov (5, 'Enter Grade', 'GRADE_LOV_CRNC','onBlur="return validate_grade(this,''FW_DATE_'||ROWNUM||''')"','NO',NULL,NULL,'GRADE_'||ROWNUM)
When the column is NULL, the Select List (LOV) contains the entry 'Enter Grade' and that is the value displayed on page load. I bypass the value 'Enter Grade' during Submit Processing where database updating occurs.
I did not find the need to enter values for p_null_value and p_null_text since I don't believe that it would cause the 'Enter Grade' value to display on page load for null value columns but rather would enable the user to select 'Enter Grade' from the list and have a specified return value stored in htmldb_item array.
Again, thank you for the help!