**** single select *****

- TAB on non-unique completion should select first item in list
  and force an arrow selection

- support mouse hover highlight in completion listing
- when opening picker, highlight current value 

- Q: unify completion and picker ? (won't work for trees)

- organize code to have more than one field on same page


- remember last scrolled selection in picker w/cookie (optional)
- hover windows should be posititioned above or below depending
  on available space
- hover windows should have maxheight set based on available space
- support html escaped characters
- support a hidden "selected id"


** HIERARCHY SUPPORT
  - expandable tree in picker ?

** PERFORMANCE
  - new design: render data into a hidden DIV and make all
    operations work on this rendered data, instead of using
    a javascript array.


** DONE
- don't show completion window if the selector is an exact match
  for an entry. (unnecessary)