Extending the Flex Alert Class


I’m working with flex but my question is OO related.
There is a class Alert and it shows a kind of messagebox on screen.

it has a static function show(parameters)
and some static variables: yesLabel,noLabel etc

I want to create an Alert class with the labels in Dutch.
I created the class AlertDutch which extends Alert but it seems I can’t access the public static funtion show.

the question:
Do I have to encapsulate the whole thing?
Do I have to write the function show with its paramters in my custom class and then just call the Alert.show(paramters) function?