How do I prevent users entering more than 3 lines to an input texfield?

programming flash
1

Hiya, thanks for checking my post out. I have an input textfield where users can enter information over three lines. I have set a maximum chars property of the number of characters for the 3 lines but the user can still enter more than 3 lines of text if they press enter.
Is there a way i can limit the entry into the box to 3 lines without splitting it into 3 single line text boxes?

Thanks for your suggestions in advance :slight_smile:
Schm,