Move _applyXmlAttribute outside @private block.
Move _applyXmlAttribute outside @private block.

Fixes a broken interface implementation error in the public d.ts.

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