It's a focus border.
Usually, it's blue. I'm not sure how it's red in your case!
You can change the color following this example.
Thanks to Peter Dehaan for his great tip.

OR you can hide this by using the property: focusAlpha
<mx:TextInput id="txtInput" focusAlpha="0"/>

Good luck.

--- In, dorkie dork from dorktown 
<dorkiedorkfromdorktown@...> wrote:
> When I display my Form elements (TextInput, Combox, etc) the red error
> border is shown right away before the user even types into it. Why is this
> happening? How can I prevent it from showing a red error border when it's
> first displayed?

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