Adventures with "OleControl Shell.Explorer.2" deleting the temporary files issue.

ok, got my OleControl Shell.Explorer.2 activex control to work and it shows pdfs and graphics files.  But of course it needs a pdf file to exist so I create one.  I am storing the documents in my mssql database as a varchar(max)

So, when my user wants to view the document, I create a temporary file and ole.navigate2 to the file.  

But when I close the form, I want to delete the temporary file but of course it is in use.

So I navigate2 to "About:Blank" but I still have to wait .3 of a second before it is released.

inkey(.3)
delete file (tempfilename)

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Tried a DOEVENTS but no difference.  I also have this after I navigate to the blank page:

DO WHILE (this.Olecontrol1.Busy OR this.Olecontrol1.ReadyState <> 4) 
   DOEVENTS
ENDDO

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but again, still need the delay.  So any ideas, not sure if the inkey(.3) is going to be enough for all my client's slow machines and it seems like a patch and not a solution.