Using WHEN-LIST-CHANGED on T-list to navigate block records

Question

I have a form on which I use a T-List to list all of the child records in a block based on the selected parent record of the form. I am using the T-List almost strictly for navigational purposes (and eventually later for delete purposes as well). Above my T-List on the form is all of the individual fields that display the details of the record that is selected in the T-List. My POST-QUERY trigger on the block populates the T-List with all of the child records, and also uses the value of the highest (max value) child record to updated all of the detail fields for the block. I also have a program unit that updates all of the detail fields for the block that gets called from my WHEN-LIST-CHANGED trigger for the T-List. It passes the key value from the T-List to the program unit and updates all of the child record detail information.
My problem comes when I attempt to actually update the currently selected child record. I've tried a number of different things to get this to work, but none of them have completely worked, and I'm coming to the end of my knowledge base and can't figure out how to make this update the child record correctly. Initially I was having a problem where the form actually WAS performing the update, but it was always (no matter which list item I had selected) updating the same record, which was the first record that was retrieved for the block. I've run the form in debug mode, and checked the actual values of the child record fields after I've changed the selected item in the list, and all of those fields are actually the correct values corresponding to the selected item in the list, but for some reason, it won't update the record that is currently in those fields when I do a save. From what I can tell, I need to be able to somehow actually navigate the records in that block when I click on an item in the list (i.e. perform next_record or previous record until the block gets to the record that corresponds to the item selected in the list) so that the form recognizes and attempts to update the correct record.
Has anyone out there tried this before? Does anyone know of a solution for how to do this? Any help would be greatly appreciated. Thanks in advance.
-::YEX::-
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Answer 1

1. WHEN-LIST-CHANGED trigger is not for items it is for List items (Pop , COMBO, Tlist)
2. Try to write a code on WHEN-VALIDATE-ITEM at field level with code similar to this
if :custname is not null then
begin
      select ship_to_location into :ship_to_location
        from tablename
     where custcd = :custcd;
exception when no_data_found then
      ----call some alert and error message.........
end;
else
  :ship_loc := null;
end if;plz mark it helpful/correct if it is