Sending Standard Push Notifications to Newsstand Apps

How do you send standard push notifications to a Newsstand app? When I say "standard", I mean the typical alert box that pops up with the message.

I am using Urban Airship and have the "content-available" push working fine like so:

 {"aps":         {"content-available": 1        }, "device_tokens": ["1234ABCDKKGGOGOGG85986598750870870875708ASD"] }

But when I try to send a standard push, the alert never pops and my delegate

application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo 

is not called:

     {"aps":         {"alert": "Hi, from Urban Airship!"        }, "device_tokens": ["1234ABCDKKGGOGOGG85986598750870870875708ASD"] }