widget_bug.rb

class Shoes::MyWidget < Shoes::Widget
  def initialize
    background blue
    para "this is MyWidget"
  end

  def addpara p
    para strong(p)
    p self # this always prints (Shoes::MyWidget)
  end
end

Shoes.app do
  background yellow
  flow :width => 300, :left => 100 do
    @w = my_widget
  end
  # actually adds to the app
  @w.addpara "XXX"

  # the following does what I would have expected (adds the para to the widget)
  Thread.new do
    sleep 0.1 # <- this is needed
    @w.addpara "YYY"
  end
end