I saw a note application where you had 3 textfields: 
  1 - search bar
  2 - results heads
  3 - content
You could jump up and down really easy with Cursor-Up/Cursor-Down.

A similar approach would be nice for the "Search All Notes" dialog:

 a) the cool variant:
   - make the search bar a simple text input (instead of with a dropdown)
   - make Cursor-Down in the search bar jump to the list of notes
   - make Cursor-Up in the list of notes jump to the search bar if the first is selected

 b) the less awesome variant
   - Change the tab order that the list of notes follows the search bar immediately, then the notebooks list.



Other information: