Dear Telerik Team,
As I saw on your website in the below link, the Calendar control for UI for Winforms does support Arabic calenders including Shamsi, Hijri:
However when I try to set the calender to Shamsi calendar, the calendar is still Gregorian it only translates the day and month names, but based on what I saw on your website there was an actual Shamsi calendar.
I am using Telerik UI for WinForms Q2 2015
Below is the screenshot.