CJuiDatePicker doesn't work for me

I copied the documentation’s example for CJuiDatePicker:

$this->widget('zii.widgets.jui.CJuiDatePicker', array(


    // additional javascript options for the date picker plugin








The form field is rendered, but when I click it nothing happens, no calendar is displayed.

Am I missing something? do I have to manually include JQuery, or set some javascript callbacks or anything else than the example above?

post the html produced by this page, also verify that the imported js and css files exist in assets.