Basic skeleton app & lib, throws a window up

lib/tailor.rb

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+require "tailor/version"
+require "tailor/GUI"
+
+module Tailor
+  # Your code goes here...
+end

lib/tailor/GUI.rb

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+require 'wx'
+
+module Tailor
+  module GUI
+    class Application < Wx::App
+      def on_init
+        MainWindow.new
+      end
+    end
+
+    class MainWindow < Wx::Frame
+      def initialize()
+        super(nil, -1, 'Tailor')
+        @mainpanel = Wx::Panel.new(self)
+        @close_button = Wx::Button.new(@mainpanel, -1, 'Quit')
+        evt_button(@close_button.get_id()) { |event| close_button_clicked(event) }
+        @mainpanel_sizer = Wx::BoxSizer.new(Wx::VERTICAL)
+        @mainpanel.set_sizer(@mainpanel_sizer)
+        @mainpanel_sizer.add(@close_button, 0, Wx::GROW|Wx::ALL, 2)
+        show()
+      end
+
+      def close_button_clicked(event)
+        puts "I don't do anything, but good on you for using a mouse"
+      end
+
+    end
+  end
+end

lib/tailor/version.rb

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+module Tailor
+  VERSION = "0.0.1"
+end