A workaround for https://github.com/Catsquotl/tcm-study/blob/master/StartGUI.rb

StartGUI.rb

require 'green_shoes'
require_relative './orgaan'
include OrgaanGui

Shoes.app title:"Shu Ha Ri",width: 1280, height: 720 do
  background khaki, height: 2000
  @m=[]
  
  fwin1 = flow width: 0.5, height: 0.3 do
    para "In onderstaande lijst kunt u een keuze maken 
    uit de verschillende orgaansystemen van het menselijk lichaam",align:"center"
    list = Dir.glob("./data/*.yml").sort
    list.each do|x|
      s = x[7...-4]
      @m.push(s)
    end
    list = list_box :items =>@m
    list.change{|choice|
      dat = File.open"./data/#{choice.text}.yml",'r'
      a = Psych.load dat
      dat.close
      @fwin2.clear { 
        a.punten.each {|e|
          button e.afk, :height =>30, :width =>50  do
            @fwin4.clear{ stack do
              para strong("Afkorting:"),"#{e.afk}\n",
              strong("Ch.naam\t:"),"#{e.chname}\n",
              strong("Naam\t:")," #{e.name}\n",
              strong("Locatie\t:")," #{e.locatie}\n",
              strong("Aard\t:")," #{e.aard}\n",
              strong("Actie\t:")," #{e.actie}\n"
            end
            }
          end
	}
      }
      @fwin3.clear{}
      @fwin3.append{
        #timer 0.01 do
          #window do
            a.functies.each do |k,v|
              para strong k
              para v
            end
          #end
        #end
      }
    }
  end
 
  @fwin2 = flow width: 0.5, height: 0.3 do
  end

  @fwin3 = flow width: 0.5 do
  end
  @fwin3.append{}

  @fwin4 = flow width: 0.5, height: 0.7 do
  end
end