How to show scroll bars only if actually required

Hi All,

Is there a way to automatically show scroll bars on a multi line edit
control only if they are actually required?
i.e. If the text is small enough to fit in the edit box, don't show
scroll bars and if the text doesn't fit show the appropriate scroll
bars (i.e. vertical, horizontal or both).
Of course I'd like this to be all automatic and not have to
recalculate the size of the text myself every time the user adds or
delete a character.

Thanks
JB