Scrolling through message thread while typing new message....

😕 Prior to iOS7 when I typed a long text I could press edit while typing to scroll up to see the previous message. Now once I've filled the screen I can't find anyway to go back and look at the previous message until I've pressed send... I type a lot of long messages and it's annoying to not be able to see what I'm replying too..... Anyone know how to do this ? Thanks....