May be you have to create a resizable text area.
Sadly, none of the solutions worked. They even generated some errors, probably because they were created for an older version of Flex.
I've not figured out the solution for this, but you can replace the textArea with mx:Text always and try, it will autumatically expand to the text when a static width is mentioned.
using <mx:Text> causes an error. I don't think this can be used in a view (or I am doing something wrong).
The error is "could not use <mx:Text> to a component implementation."
On a more detailed debug I managed to find what is causing this. it is this line: StyleableTextField(newstext.textDisplay).htmlText = content;
Is there any other way to put HTML text inside a textarea? Thanks.