How to close Acrobat.exe from the task manager processes through plug-in?

Question

I have a plug-in in which we have a functionality of defining some keys and they are displayed as annotations on the PDF. Now, if the user defines such a key, an annot (i.e.a rectangular box) gets displayed on the PDF and if the user does not click custom menu say 'Close Key' then annot remains visible on the PDF.
My problem is if in such a case i.e. the user has defined a key & if the user does not hit 'Close Key' and instead closes Acrobat by directly hitting close (i.e. [X] button at top right corner), then Acrobat exits; but the Acrobat.exe remains running in the Processes.
If the user tries to open the same PDF again then a message pops up saying 'Cannot open file for viewing as its already in use...'.
Note that any other PDF gets opened fine.
Could somebody help me in giving me any ideas/suggestions on this? I want to exit the acrobat.exe from the processes so that the same PDF could get opened. As described above, the cause is the key (annot) was opened and user abrubtly exited Acrobat. Is there a way, that we could catch this Acrobat exit event in the plug-in? That way, I'd be able to clear off the annot (key) and then close acrobat.
Please let me know asap.

Answer 1

Hey, tnx for ur response! But, the issue is reproducible on Acrobat 7.0 Professional.
I do have the 'WillClose' event registered in my plug-in. Below is the event that is wired up with 'WillClose' event:-
static 
ACCB1 void ACCB2 NotifyAVWillClose (AVDoc doc, void *clientData){
UNREFERENCED_PARAMETER(clientData);
UNREFERENCED_PARAMETER(doc);
CloseTemplate(TRUE);
The 'CloseTemplate' method performs the closing of the annotation, clearing of objects and deleting the PDFfile class pointer.
And this all works fine with Acrobat.exe getting closed from the task manager processes in acrobat versions 8 & 9. However, in Acrobat 7.0, the process remains in the Task Manager.
Could you suggest any ideas on what else needs to be implemented to end the process in Acrobat 7?
Thanks!