code: func (v *Button) GetEventWindow() (*gdk.Window, error) {
  	c := C.gtk_button_get_event_window(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  
  	w := &gdk.Window{glib.Take(unsafe.Pointer(c))}
  	return w, nil
  }
docs: // GetEventWindow() is a wrapper around gtk_button_get_event_window().