Including the entire Jquery UI javascript (192kb minified) to just have a datepicker integrated into the grid is a bit excessive.

The author's web page says you can include 2 files, ui.core.js and datepicker.ui.js (both available off the site in google's repositories) and minified, they come to a total of 55kb, much smaller than the initial 192kb and because I would only use the datepicker and no other Jquery UI script, find it more useful than the chunky file that needs to be included as well just to make 1 feature work.

However, the datepicker does not seem to popup with those 2 files, only with the jquery.ui javascript file.

Why is this? Essentially it's exactly the same code as the author donated it to jquery themselves?