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dice_withclear by enrique 

# Dice roller with result replacing previous roll
# Trick is that 'para' automatically adds a new paragraph
#  and so we can clear the @results box and then put the 
#  number into it.
# See 'Nobody Knows Shoes' by _why (PDF pages 46-47)

Shoes.app do
    button "d20" do
      @results.clear do
        number = 1+rand(20)
        para number
      end
    end
  @results = stack :margin=>20, :width=>50
end