Hey I was trying to figure out how to dynamically make the grow in 
height with the textArea in my component.

by checking the docs here 
http://livedocs.adobe.com/flex/3/langref/mx/controls/TextArea.html#textH
eight

I was called the validateNow() method on the line 76, I was tried both 
height & textHeight. However, it didn't work correctly.

_txtHolder.setActualSize( unscaledWidth, _txtHolder.height );
_txtHolder.setActualSize( unscaledWidth, _txtHolder.textHeight );


code is here:

http://www.privatepaste.com/c1QXxA5NBO

Any suggestion

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