Navigation between Category and top result done.
Navigation from top result to search text box has been done.
Merge branch 'DUI-KeyNavigation(fromCategory-to-Category)' into DUI-KeyNavigation(fromCat-to-Top-to-Search)
Comments added and e.Handled = true moved to very end.
Check for topResult.IsFocused removed.
Merge pull request #137 from vmoyseenko/DUI-KeyNavigation(fromCat-to-Top-to-Search)

DUI: key navigation. Part 4