Application crash on showing alert message after closing document in CS5

Question

My application crashes when I show alert message after  standard close using IDocFileHandler's close method i.e
Close( doc, uiFlags, allowCancel, cmdMode );
Before calling this method there is no crash on showing alert messages.
i.e just one line before Close() method is called I am able to show alert message. And just one line after close method call , after showing alert message when I  click on OK button of alert message  my application crashes.
I tried to use errorcode but returned value was fine i.e no error.(Checked GlobalErrorCode and GlobalErrorString before and after close).
I also tried CanClose method to check but it worked fine.
I also used IDocumentCommand methods but application crashed without showing  alert message.

Answer 1

I used PMSetGlobalErrorCode(kCancel) after closing document and it worked.