Malcolm,
Another thought that came to me today, is that if you size the edt with the scrollbar turned on and then when you've got the height where you want it resize the width down by the sysmetric(5) at the same time you turn off the scrollbars and the text shouldn't reflow causing an empty space at the bottom.
>Well, that's a very, very clever solution. Thinking outloud: I can loop expand my editbox one line (determined by fontmetric) at a time until the scroll bar indicates its inactive. I will have to adjust the width of my editbox to account for the scrollbar which I will then remove when I'm done. All behind the cover of LockScreen = True, of course.