Jquery datepicker crash with jqueryui/cupertino/jquery-ui-1.8.7.custom.css

If apply jqueryui/cupertino/jquery-ui-1.8.7.custom.css, datepicker  calendar will not appear.
- .ui-helper-hidden-accessible clip property will cause it hidden.

To fix:
add in "clip:'auto' css
- Replace  inst.dpDiv.css({position: 'absolute', display: 'block', top: '-1000px'}); with inst.dpDiv.css({position: 'absolute', display: 'block', top: '-1000px',clip:'auto'});