def find_reverse(str)
      index = items.reverse.index {|i| i.index < current_row && i.name.start_with?(str)} || items.reverse.index {|i| i.name.start_with? str}
      move_cursor items.size - index - 1 if index
    end
def find_reverse(str)
      index = items.reverse.index {|i| i.index < current_row && i.name.start_with?(str)} || items.reverse.index {|i| i.name.start_with? str}
      move_cursor items.size - index - 1 if index
    end
Focus at the last file or directory of which name starts with the given String.