[dokuwiki] css caching

a quick newb question here:

i think my Q is not plugin-specific, but still - a long story is:
i am using a gcalendar plugin and one of its features is to allow to
configure my own background images via css. so i did that and i see my new
css classes when I call mywikiurl/lib/exe/css.php.
BUT I do not see these when I refresh the wiki the page. I also have the
WebDeveloper firefox plugin and it does not show me the classes I created.
(CSS-> View Style Info)

I understand that css.php does some css caching. how do I reset it? I tried
calling ?purge=true and ~~NOCACHE~~ to no avail.

thanks

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