I have a RadWindow opened from a page. I need to do some server side code to build a link, then I'm trying to Response.Redirect to that link, but the window does not show the new page. If I add a link to the page and click it, I see the browser saying "loading <mypage>" but again, the radwindow does not display the new page. 

Here's my Radwindow:


What is preventing the RadWindow from navigating to and displaying the new page on the redirect?

UPDATE: If the page is within my application it works, but if I try to load an external page it doesn't. In this case my page is building the Twitter Authorization link, which then redirects to the Twitter Authorization page, but it won;t show that. (Note: I've tried google.com and others, it's any external page that won't load. 

Why can't I load a page from outside my application into a radwindow?

UPDATE RESOLVED: 
This isn't an issue with the RadWindow. The page I am trying to load is prevented from being loaded in a frame. Since the RadWindow uses an iframe it can't be displayed. In this case I have to use a different method of creating the dialog window (which is unfortunate because its inconsistent with the rest of the site)