CCEditBox line breaks

i’m using cocos-x-2.1.5. (c++)

[implementation]

CCEditBox* editTest= CCEditBox::create(CCSize(200, 100), CCScale9Sprite::create(“xxx.png”));
editTest->setPosition(ccp(240, 160));
editTest->setFontColor(ccBLACK);
editTest->setFont(“Arial”, 12);
editTest->setPlaceHolder("");
editTest->setMaxLength(1000);
editTest->setReturnType(kKeyboardReturnTypeDefault);
editTest->setInputMode(kEditBoxInputModeAny);
editTest->setDelegate(this);
this->addChild(editTest);

[result]
push return key -> keyboard is down.
don’t occur line break…

How can CCEditBox line breaks?