Hello Jamal Husien,
Thank you for your interest in RadRichTextBox.
As it comes to the support of right-to-left typing, unfortunately, we cannot offer a specific timeline for it, as we have other features of higher priority planned for Q3 2010. The specifics on the roadmap are visible on our web site ( http://www.telerik.com/products/silverlight/whats-new/roadmap.aspx )
If you have any other questions, do not hesitate to contact us again.
the Telerik team
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