Using nsDialogs on a non-custom page

Hi!

Is it at all possible to use nsDialogs to programatically create an additional control on a non-custom page, such as the standard license page? If so, how would I go about it?
I've tried using nsDialogs::Create and nsDialogs::CreateControl in the page's Show function with no luck. It seems to break the installer.

Any ideas?

Thanks in advance.

Brad.

Though that was one of the initial design considerations, it is still not possible. You could, however, use the HelpButton plug-in to add an extra button to built-in pages.