extern class NativeButton in "Java" `{ android.widget.Button `}
	super NativeTextView

	redef fun new_global_ref import sys, Sys.jni_env `{
		Sys sys = NativeButton_sys(self);
		JNIEnv *env = Sys_jni_env(sys);
		return (*env)->NewGlobalRef(env, self);
	`}
end