FBLoginDialog not shown
<p>I'm an iphone newb.  I added the following code to my viewDidLoad() method but a blank screen shows up.  What am I doing wrong?</p>

<p>FBSession *session = [FBSession 
             sessionForApplication:@"a31c3e53bba4a5f2b3955d6e5e 876717"
             secret:@"6ecbefa3807406bd13187297e58efae9" delegate:self];</p>

<p>FBLoginDialog* dialog = [[[FBLoginDialog alloc] initWithSession:session] autorelease];</p>

<p>[dialog show];</p>

<p>Thanks!</p>
