I'm not sure if this will be at all helpful, but in my own experience with this issue, it's not just
e.returnValue but ''all'' members of the event object that are inaccessible, including
In my case, I'm using the jQuery Tools tooltip plugin with a delay. When handling a custom event that fires just before the tooltip is shown, I do a test that would allow me to prevent the appearance of the tooltip by returning
false from the handler. When I do that, and consequently
event.stopPropagation(), both of them have trouble accessing the original event object.
I used the IE script debugger, and at that point in time, every property of the event object is marked as
Member not found.