FireMonkey C++ Components problem for non-english Text (e.g. Arabic)

Hi, I've a question in FireMonkey C++ in developing apps on iOS device (version 10.2.1). My problem is, when I set a non-english message (e.g. Arabic) on Text property of TButton component, it dose not shown in run time on iPhone device! This problem is existed on another components such as TListBox (TListBoxItem) or TMenu or ... . How I can solve this problem? Another question is, how I can create/open/read/write a file on iOS root app. All methods I've used, it is failed or not permitted.  Thx a lot Ghader