Document ordering in attachment tab

Question

Hi all,
I am a bit confused about the ordering of document in attachment tab of livecycle.
My customers ask for a chronological order of document when they add attachment from the workflow. I think the easiest way to do is use a list of document, and add new document at the end of the list whenever it is added, but LiveCycle seems to display them in very strange order.
My scenario is:
LCES process adds 5 documents in the attachment list. (it adds 1 document at first task, 2 at second task and the last 2 documents at the third task)
I create following variable:
- attachmentList: List of <document> (to store and display in attachment tab)
- tempDocument: document (to store generated pdf here and add it into attachmentList)
- genCounter: int (to differentiate if user generate pdf many times)
After generate the pdf, I call a execute script similar as follow:
=====================================================
import java.util.List;
import java.lang.String;
import com.adobe.idp.Document;
import java.io.File;
Document doc =  patExecContext.getProcessDataDocumentValue("/process_data/@tempDocument");
int genCounter = patExecContext.getProcessDataIntValue("/process_data/@genCounter");
File file = new File("finalDisbursementLetter"+genCounter+".pdf");
doc.copyToFile(file);
Document doc1  = new Document(file, true);
List list =  patExecContext.getProcessDataListValue("/process_data/attachmentList");
list.add(doc1);
=====================================================
The order of file being added is (top to bottom):
[1]
GrantApplicationForm.3214.pdf
draftDisbursementLetter1.pdf
draftPaymentVoucher1.pdf
finalDisbursementLetter1.pdf
finalPaymentVoucher1.pdf
but when I see in the attachment tab, the order is:
[2]
GrantApplicationFormFTS000908000017.3214.pdf
draftDisbursementLetter1.pdf
finalPaymentVoucher1.pdf
finalDisbursementLetter1.pdf
draftPaymentVoucher1.pdf
I have tried with a custom component to list the file name, it still display correct order, i.e. as [1].
Do I miss out any thing or can you let me know what ordering of attachments that Livecycle is using?
Thank you,
Anh
P.S.
When it first add 3 document, i still see it displays correctly. i.e.
[3]
GrantApplicationForm.3214.pdf
draftDisbursementLetter1.pdf
draftPaymentVoucher1.pdf
But when adding 2 more documents, the ordering is very strange as [2]

Answer 1

I tried to download the 5 documents and try sorting with windows, i realized that if I download 1 by 1 by the order:
GrantApplicationForm.3214.pdf
draftDisbursementLetter1.pdf
finalPaymentVoucher1.pdf   
finalDisbursementLetter1.pdf
draftPaymentVoucher1.pdf  
and sort by accessed time, I will have the order as [2].
i.e.
GrantApplicationFormFTS000908000017.3214.pdf (6:58:18/6:58:18/6:58:46)
draftDisbursementLetter1.pdf (6:58:18/6:58:25/6:58:25)
finalPaymentVoucher1.pdf    (6:58:18/6:58:28/6:58:28)
finalDisbursementLetter1.pdf (6:58:18/6:58:30/6:58:30)
draftPaymentVoucher1.pdf    (6:58:18/6:58:32/6:58:32)
The timing are created/modified/accessed in order.
I don't know why it sort by accessed time or it is just a coincident ...
Regards,
Anh