How to use CCTextField

Can someone show me a simple example with a CCTextField.

I create CCTextFeild this way.

CCTextFieldTTF * pTextField = CCTextFieldTTF::textFieldWithPlaceHolder("click here for input", CCSize(visibleSize.width, 30), CCTextAlignment::kCCTextAlignmentLeft, "Thonburi", 20); pTextField->setPosition(ccp(visibleSize.width / 2 + origin.x, visibleSize.height / 2 + origin.y)); this->addChild(pTextField);

but either clicking on it does not show the keyboard.