Trapping and handling the document close event.

Is there a way to trap the document close event via Javascript so that the script handles the event?

I want to present my own dialog box and options when a user attempts to close the document.

Trapping the Document WillClose event certainly allows me to run a script when the user attempts to close the document, but it does not allow me to cancel the event or prevent the Acrobat's own document save dialog from popping up.

Setting the doc.dirty property to false prevents the save dialog from coming up, but I can still not cancel the event via script.

Any thoughts/suggestions on how I can handle this?