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The closest solution I can suggest is to restrict the manual input of the NumericStepper. You can't access the inputField of the NS class but this is a way around it:
<mx:NumericStepper minimum="0" maximum="10000" stepSize="0.01"
This way, a comma can't be typed any more
Thanks. That worked. I assume now, that I could also do this in a custom class. Any thoughts?
The easiest way to do that is to make a mxml custom component base on NumericStepper and add the same creationComplete handler in the root tag. That way, you can implement it as