You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.
"The key is... Make it Yours! Take this attractive paper and let the designer customize the look with you. I removed Thank You from the front of the card, and just put my fiance's name and my name. That way, I can say Thank You on the inside of the card-where it belongs. It's a perfect match to my invites!"