Arabic text in as3

The Text Layout Framework can handle right to left text.

try to add textformat with propriety right alignment

var txtFormat:TextFormat = new TextFormat();
txtFormat.align = "right";

If you're not opposed to the flex framework, it now includes a decent internationalization library that should allow you to do this easily. Here's a decent place to get started http://devgirl.org/2011/03/15/flex-4-localization/