Newbie (seeks Black-Hat) re issues with jqgrid row editing (datepicker) and examples towards my overall design model

Newbie (seeks Black-Hat) re issues with jqgrid row editing (datepicker) and examples towards my overall design model

Hi all...
Firstly, I'm experiencing the below when implementing the simple example (per: http://www.trirand.com/blog/jqgrid/jqgrid.html)

 TypeError: $.ui is undefined @ http://localhost:3000/javascripts/jquery-ui/ui/jquery.ui.datepicker.js:1608

This occurs when I click focus to the date column to edit.

All js,css loaded 200/OK, e.g.
GET http://localhost:3000/javascripts/jquery-min.js [HTTP/1.0 200 OK 3ms]
GET http://localhost:3000/javascripts/jqGrid/js/jquery.jqGrid.min.js [HTTP/1.0 200 OK 7ms]
GET http://localhost:3000/javascripts/jquery-ui/ui/jquery.ui.datepicker.js [HTTP/1.0 200 OK 8ms]

This is my first attempt at jquery.  I was prototyping with it as jquery seemed to have "something for everything"... whereas it seemed other kits aren't as flexible in the app design models that they would easily support.
...which brings me to the design outcome that I'm trying to achieve; and I have t say that at this moment, I haven't found anything (examples/etc) that in fact describe whether it is easily achievable, although at face value jquery seemed to read as if it might.
I'd like to leverage a Store - which would interact with the server via JSON (deferred/promise) after the Store itself being updated by for example jqgrid. The Store would then be visualized via jqgrid, charting, gantt or whatever other method should be able to source data and/or update the Store.  
Typical examples don't seem to provide a (similar/related) end-to-end use case ... which is odd, given that I'd have thought that this design model would be what a lot of apps would strive for.
Anyways, being a newbie to JQ, the error above is hopefully newbie-related.  The use/objectives (re Store/jqgrid/etc) hopefully can receive some guidance from a JQuery Black-Hat (or at worst, some advice that it is too optimistic for the kit at its current state).
...in anticipation, thanks