adding text boxes at runtime and setting autosize to True

I have a form on which the user is allowed add up to 99 textboxes and
type information into the texboxes. I can set the multiline and
wordwrap to true, but, I don't think I can set autosize to true, at
least not when the text boxes are created by a user clicking on a
button on a form. If possible, I would prefer not to create all 99
textboxes and then make them invisible until needed. I would like to
create each one as needed by the user. The user will need to have all
the text in the box displayed on-screen at the same time, not in a
scrolling box with only one or two lines of text visible.