How to hide partial lines in a TextArea

I am using a TextArea component and programatically assigning some text to it. Sometimes, the last line does not fit into the given width and height of the control. Is there any way I can not show any lines that are partially displayed?
Any advice is welcome.
Thanks,
Om

Gordon, I tried the isTruncated() method. It is returning false all the time even though the text is visibly being truncated. From the documentation,
=================================================
isTruncated()    method
public function isTruncated():Boolean
Language Version:     ActionScript 3.0
Product Version:     Flex 4
Runtime Versions:     Flash Player 10, AIR 1.5
Determines if the text, once composed, has been truncated.
=================================================
I am programatically setting the text value of the RichText control. But the docs say that the isTruncated will return truncation only after the text has been composed. Does this mean that I have to wait for an event or maybe a timer interval before I can query for this value?
To be safe, I create a timer and query the isTruncated() a second after I set the text value. But it still says isTruncated is false when the text is obviously getting truncated.
Is this a bug or am I missing something?
Thanks,
Om

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