Flex :: Spark TextInput Incomplete Value Using Barcode Reader?

working with Flex4 AIR app, using this component I get data from the barcode reader,

<s:TextInput id="barcode" enter="showBarcode()"/>

Then for handle the enter event, wich is automatically triggered when reader finishes its reading

private function showBarcode():void{
Alert.show(barcode.text);
}

Ok, very simple. But my problem is: the text showed in the Alert Box is incomplete, it misses one or two digits (last) or it just shows the entire text in the TextInput component (correct view)

I already test my BC reader using the notepad, and it's fine.

I have tested same code using MX components in Flex3 web app, and there's no problem.