There are two kind of dropdowns you can set after you initialize the widget ($state = $this->createWidget(‘application.extensions.jQueryCascade.jQueryCascade’):
dropDownList
activeDropDownList
Both looks like the ones from Yii with an addition of three parameters at the end:
source: the URL from where you take the info
cascaded: the depending dropdowns
callback: a not very well implemented way to fire a javascript function after the data is loaded.
If problems please give me more info about how did you use it