gtk/window.go
func (v *Window) SetStartupID(sid string) {
	cstr := (*C.gchar)(C.CString(sid))
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_window_set_startup_id(v.native(), cstr)
}
func (v *Window) SetStartupID(sid string) {
	cstr := (*C.gchar)(C.CString(sid))
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_window_set_startup_id(v.native(), cstr)
}
// SetStartupID is a wrapper around gtk_window_set_startup_id().