Submitting an Ajax Modal

[Luther Baker <lu...@gmail.com>]

I have a form with an AjaxFallbackButton that populates and displays a Modal
form.

It all works but when I SUBMIT the Modal form I am presented with a
Confirmation Dialog:

Are you sure you want to navigate away from this page?
Reloading this page will cause the modal window to disappear.
Press OK to continue, or Cancel to stay on the current page.

Is my browser doing this? Is there a flag I can set to disable this? Is it
evident that there is a problem with my relationships of panels and forms
such that this Confirmation Dialog shouldn't normally appear.

Thanks,

-Luther