CascadingDropDown PromptText -- CSS?

Is there any way to assign a CSS-property to the PromptText property of the CascadingDropDown?

I have attempted modifying the Toolkit (CascadingDropDownBehavior.js):

_setOptions :function(list, inInit, gettingList)

// code omitted

if (headerText) {

var optionElement =new Option(headerText,"");

optionElement.className = "PromptText";

e.options[e.options.length] = optionElement;

}

But this didn't work Any ideas?

Thanks in advance.

Well, I found a workaround... Forgot to post here. For those interested, I wrote about this in my blog:

http://haltenberg.blogspot.com/2007/02/cascadingdropdown-passing-additional.html