prevent saving when just closing

Hi,

I would like my record to be saved only when my own close button (with all

it's checks) is used.
I made the winodws close button disappear, but you still can close using
the 
right mouse click.
also when designing, going to design mode saves the record.

So I tried: OnClose : Me.Undo.
My own cancel button uses it and it works ok,
but not in the OnClose event.

how to prevent the record to be saved when just closing.

I hope I could make myself clear...

TIA

Michiel