He's talking about the minimalist Text Window you get when you do something like Amplify/Context.
That window has a GoTo box, but no Search box, and the Tab-highlights-the-entire-box-contents function is [most certainly unintentionally] missing.
Clint/Darin, if the selection is in text, then Tab will highlight the GoTo box, just not if the blinker is in the GoTo box.
When that is the case, you can use to highlight the GoToBox:
⌘A (command a)
⇧↑ (shift left arrow) (when the insertion point is at the end of the text in the GoTo Box)
⌥⇥ (option tab, to put the selection in the text area), then ⇥ (tab, to highlight the GoTo Box)
You may want to consider a workflow that uses the full Search Text window more often.
Edited by Joe Weaks, 19 February 2014 - 12:21 PM.