Fixed the error thrown when setting TextField.secure.
Fixed the error thrown when setting TextField.secure.

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