Validators don't reset the focus "halo" color

Question

If I use a TextInput's "change" event (rather than it's
"valueCommit" event) to trigger the Validator, the thin red line
around the TextInput (and the control's errorString property) is
updated correctly by the Validator after each key depression but
the control's "focus" halo isn't updated. The "focus halo" appears
to be evaluated only when the UIComponent receives focus. As a
consequence in the example below I can be sometimes left with red
halo around a valid TextInput and a blue halo around an invalid
control. Is there any way to get the FocusManager to reevaluate the
halo color each time the Validator runs?
<mx:Application >
<mx:NumberValidator id="numberValidator" minValue="2"
maxValue="10"
source="{this.textInput}" property="text"
triggerEvent="change" />
<mx:TextInput id="textInput" />
</mx:Application>

Answer 1

I had once a similar problem and i solved it like this:
if (numberValidator.source.errorString != "") {
numberValidator.source.errorString = null;
You could try this code inside your TextInput's change
event