Fixed improper unbind implementation
Fixed improper unbind implementation

genexliu/NativeScript,NativeScript/NativeScript,hdeshev/NativeScript,genexliu/NativeScript,hdeshev/NativeScript,NativeScript/NativeScript,hdeshev/NativeScript,NativeScript/NativeScript,genexliu/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript