title: Gtk.Application in Genie
body: <p>I can not find information or examples about "Gtk.Application" in Genie.</p>
  
  <p>What is the correct way of using the Gtk.Application class in Genie?</p>
  
  <p>Good day and thank you</p>
  
  <p>EDIT: I do not know if this is the best way to do it, but my code is this:</p>
  
  <pre><code>// compila con valac --pkg gtk+-3.0 nombre_archivo.gs
  uses Gtk
  
  class MyApplication : Gtk.Application   
      def override activate ()        
          var window = new Gtk.ApplicationWindow (this)
          window.title = "Welcome to GNOME"
          window.set_default_size (400, 400)
          window.show ()
  
  init
      new MyApplication ().run (args)
  </code></pre>