Shoes.app :title => "Little Helper v0.2", :width => 200, :height => 325 do

  def calculate
     @hours.text.to_f * @wage.text.to_f * ((100-@tax.text.to_f)/100.0) * 4.3
  end

  flow do
    stack :margin => 10  do
      caption "Awful numbers"

      para "Hours/week " 
      @hours = edit_line(15, :width => 50) { @money.text = calculate }

      para "Money/hour"
      @wage = edit_line(16, :width => 50) { @money.text = calculate }

      para "Tax (in %)"
      @tax = edit_line(20, :width => 50) { @money.text = calculate }

      caption "Rags or riches"
      @money = para 0 
    end
  end
end