I understand that you are having an issue with the iPad's ability to send the full virtual remote signal to the AppleTV. The first step for troubleshooting when you are experiencing issues with the SlingPlayer for iPad (or any of the mobile apps) is to delete and then reinstall the application from the device.
If you are not familiar with this process, here is a link to assist you:
Please do get back in touch with us if the issue persists.
Hope this helps,
Sling Media Forum Moderation Team