GtkBuilder accepts UI descriptions and turns them into Gtk applications. In this case, the UI description is in the file helloworld.glade and can be read by the get_object() method.
Load the UI file using GtkBuilder and get the window object using the Name (or ID) chosen in Glade, and add the window object to the application:
_onStartup() {
let builder = new Gtk.Builder();
builder.add_from_file('helloworld.glade');
this._window = builder.get_object('window1');
this.application.add_window(this._window);
}
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