Windows 7: Weird behaviour of java applet under Windows 7

Hi all,

I got a problem with a java applet.
My applet was launched before under Windows XP : writable fields where white, grayed fields gray -> y):
Now I launch my appelt on a Windows 7 : writable fields are white, grayed fields are... white ! Exactly same color -> n):
So I can't make the difference betweene writable and not writable fields anymore. :=(:
If I change windows theme to "Windows Classic", it's ugly but I get back my grey grayed fields...

Any idea ? happy):

Thanks in advance !

Mefisto.