I am afraid that my end-users will leave my app (by clicking on the 'x' in the top corner) without saving (I am using buffered data).

I want to either:
1. disable the 'x'
2. find a method where I can check for saved data and query the user. In other words, what is a method that fires just after the 'x' is clicked? The 'unload' method is too late, most of what I need is gone.

Thanks, Randy