fixed #2468 modify code to call public function "addTargetWithActionForControlEvents" of cc.ControlButton instead to protected function "_addTargetWithActionForControlEvent"
Merge pull request #198 from dingpinglv/Iss2468_FixCCBReaderBug

fixed #2468 modify code to call public function "addTargetWithActionForControlEvents" of cc.ControlButton instead to protected function "_addTargetWithActionForControlEvent"