iOS 7 Phone app interface doesn't show "Decline" button when it's asleep

In iOS 7, when the phone is in Sleep mode and I receive a call, I don't see the "Decline" button. All I see is a green "Answer..." button that requires me to slide to the right to answer the call. Is there anyway we can change that? I know that there are buttons for "Remind Me Later, etc" but I want the "Decline" button.

It works fine when the phone is not in Sleep mode.

Simple press the power button once to decline the call. Notification center will keep a reminder for you about the missed call.

EDIT: Pressing the power button once registers as an ignore. Pressing it twice will drop the call to voicemail.