```ruby
module PPCurses

  class Form

    attr_accessor :elements
    attr_accessor :selected_element

    def initialize (screen)
      @win = screen
      @elements = []

      @button_pair = ButtonPair.new('Submit', 'Cancel')
    end

    def show
      y = 1
      x = 1

      for i in @elements.each
        @win.setpos(y, x)
        i.show(@win.stdscr)
        y += 1
      end

      @selected_element.set_curs_pos(@win.stdscr)
    end


    def set_selected_element(new_element)

      unless @selected_element.nil?
        @selected_element.selected=false
      end

      @selected_element = new_element
      @selected_element.selected=true

    end


    def handle_input

      @elements.push(@button_pair)

      n_choices = @elements.length

      set_selected_element(@elements[0])
      show

      while 1
        c = @win.getch

        if c == ESCAPE
          # exit for now
          break
        end

         if c == KEY_UP or c == KEY_DOWN

           selected_index = @elements.index(@selected_element)

           if c == KEY_DOWN
             (selected_index == n_choices-1) ? next_selection = 0 : next_selection = selected_index + 1
           else
             (selected_index == 0) ? next_selection = n_choices - 1 : next_selection =  selected_index - 1
           end

           set_selected_element(@elements[next_selection])
         else
           @selected_element.handle_keypress(c)
         end

         show

      end

    end


  end

end```

Use button submit instead of escape key
user
```ruby
module PPCurses

  class Form

    attr_accessor :elements
    attr_accessor :selected_element

    def initialize (screen)
      @win = screen
      @elements = []

      @button_pair = ButtonPair.new('Submit', 'Cancel')
    end

    def show
      y = 1
      x = 1

      for i in @elements.each
        @win.setpos(y, x)
        i.show(@win.stdscr)
        y += 1
      end

      @selected_element.set_curs_pos(@win.stdscr)
    end


    def set_selected_element(new_element)

      unless @selected_element.nil?
        @selected_element.selected=false
      end

      @selected_element = new_element
      @selected_element.selected=true

    end


    def handle_input

      @elements.push(@button_pair)

      n_choices = @elements.length

      set_selected_element(@elements[0])
      show

      while 1
        c = @win.getch

        if c == KEY_UP or c == KEY_DOWN

          selected_index = @elements.index(@selected_element)

          if c == KEY_DOWN
            (selected_index == n_choices-1) ? next_selection = 0 : next_selection = selected_index + 1
          else
            (selected_index == 0) ? next_selection = n_choices - 1 : next_selection =  selected_index - 1
          end

          set_selected_element(@elements[next_selection])
        else
          should_exit = @selected_element.handle_keypress(c)
          if should_exit
            break
          end
        end

      show

      end

    end


  end

end```
assistant