facebook canvas app and wp-admin dont work

I am trying to make a customer portal to the /wp-login.php page in a Facebook Canvas app for my clients to access thru facebook (to update their facebook content).

But facebook wont display any thing if i enter the address as “../wp-admin/” or “../wp-login.php” or “…/wp-admin/index.php”.

They just come up as a blank white screen inside the iframe.

I tested a page I created to work as a iframe on facebook and it worked fine, its just the admin pages that wont allow to display,

Can anyone figure this one out?