gtk/window.go
func (v *Window) HasGroup() bool {
	c := C.gtk_window_has_group(v.native())
	return gobool(c)
}
func (v *Window) HasGroup() bool {
	c := C.gtk_window_has_group(v.native())
	return gobool(c)
}
// HasGroup is a wrapper around gtk_window_has_group().