Modify CCGreeInviteDialog::setParam.
Users can pass CCArray that is including CCString with GD_INVITE_DIALOG_PARAM_KEY_TOUSERID
e.g.)
	CCGreeInviteDialog *dialog = CCGreeInviteDialog::create();
	CCDictionary *dict = CCDictionary::create();
	CCArray *array = new CCArray();
	array->addObject(new CCString("xxxxxxxxxx"));
	array->addObject(new CCString("xxxxxxxxxx"));
	dict->setObject(array, GD_INVITE_DIALOG_PARAM_KEY_TOUSERID);
	dialog->setParams(dict);
	dialog->show();