gtk/menu_before_3_22.go
func (v *Menu) PopupAtPointer(_ *gdk.Event) {
	C.gtk_menu_popup(v.native(),
		nil,
		nil,
		nil,
		nil,
		C.guint(0),
		C.gtk_get_current_event_time())
}
func (v *Menu) PopupAtPointer(_ *gdk.Event) {
	C.gtk_menu_popup(v.native(),
		nil,
		nil,
		nil,
		nil,
		C.guint(0),
		C.gtk_get_current_event_time())
}
// PopupAtPointer() is a wrapper for gtk_menu_popup_at_pointer(), on older versions it uses PopupAtMouseCursor