I mean accessing it from .NET code, not javascript. Is this just a negative vestige from javascript’s security restrictions or is this something that is there for a real reason? I frankly can’t find any.
I mean you can probably erase the guy’s hard drive from code, but you can’t access the contents of an iFrame…
I am pretty sure this limitation is connected to Internet Explorer’s XSS (Cross Site Scripting) security. I suggest briefly turning off XSS protection in IE’s security settings and having another go. If I remember correctly, the security settings for the winform browser are taken from the default version of IE, so changes in IE security apply to your form. In IE 8 you can turn off XSS protection through “Internet Options->Security->Custom Level” and checking the disable radio button for “Enable XSS Filter”.