How do i detect the maximum number of lines

Situation:
I have a textfield that displays about 8 lines of text before
the content would need to be scrolled to view the remaining
content.
Question
Rather than having some ActionScript that is constantly
trying to scroll the field, how do i detect the following.
How do i determine the maximum number of lines that may be
displayed in a textField (or any type of text field) before
scrolling would be needed?
Please specify the method. Thank you.

When tracing the output using the bottomScroll, it only tells
me how many liines I have output to the textfiedl, it does not tell
me how many lines the textfield can hold.
How do I determine how many lines a textfield can
hold?

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