jquery ui: checkboxradio CheckBox

jquery ui: checkboxradio CheckBox

Hi.  I am using several jquery ui widgets successfully, however I am having trouble getting the Checkbox feature of the checkboxradio widget to work. I can get the Radio button feature to work fine by specifying $("input[type='radio']").checkboxradio();.  The docs show using just this statement without the [type='radio'].  Do I need to specify a different type instead of radio?  (I tried checkbox and that didn't work)  

The examples also show an additional CSS file called /resources/demos/style.css which is not included in the jquery ui download.  Not sure what I'm missing.

Any help appreciated!

Thanks. Grant.