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int main (string[] args) {
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var window = new Gtk.Window();
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window.title = "Hello World!";
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window.set_border_width (12);
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window.set_position (Gtk.WindowPosition.CENTER);
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window.set_default_size (350, 70);
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window.destroy.connect (Gtk.main_quit);
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var button_hello = new Gtk.Button.with_label ("Click me!");
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button_hello.clicked.connect (() => {
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button_hello.label = "Hello World!";
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button_hello.set_sensitive (false);
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window.add (button_hello);