Add a locale, set existing ones

[big_blue]

Hi,

Is there a way for me to add my own locale to the datepicker? Also,
the only locale I seem to get working is the "fr" locale. I tried
changeing locale by adding:

<extend-property name="locale" values="fr"/>

to my module XML file. This works but when I try:
<extend-property name="locale" values="en_UK"/>
the default locale is used (which is sad because en_UK has a better
DateTimeFormat for me than the default one)

I use GWT version 1.4.61


Thanx
/Lukas