Ruby/Tk/TkButton

#!/usr/bin/env ruby
require "tk"
require "tkextlib/tkimg/jpeg"
require "open-uri"
photo = open("http://www.crossplatform.ru/style/logo.png", "rb") {|io| io.read}
TkRoot.new {title "Sunrise" }
TkLabel.new {
  image TkPhotoImage.new( :data => Tk::BinaryString( photo ) )
  width 300
  pack
}
TkLabel.new {
  font TkFont.new( "verdana 24 bold" )
  text "Sunrise at sunset!"
  pack
}
TkButton.new {
  text "Quit"
  command "exit"
  pack
}
Tk.mainloop

require "tk"
root = TkRoot.new
button = TkButton.new(root) {
  text "Hello, World!"
  command proc { puts "I said, Hello!" }
}
button.pack
Tk.mainloop