Thank you for contacting us.
Currently, our HTML-like text rendering engine does not support right-to-left languages. However, if you need to change the font of the entire text, then you can set the Font property of the message box label. The following code snippet demonstrates this:
, 12f, FontStyle.Regular);
"This is Tahoma"
I hope this will help you. Do not hesitate to ask if you have any additional questions.
the Telerik team