Xamarin iOS Designer , cannot add adaptive font size

i am working on Xamarin.iOS project. i have used size classes and have designed my complete app according to size classes , But now i am in need to change font size according to size classes (adaptive font size) but cannot find a way to do this using Xamarin Studio iOS Designer. Unlike Xcode IB, Xamarin Studio iOS Designer do not have + sign to add font constraints for required size class. Am i missing something? i have already tried to find something from documentation but was unsuccessful. if this is not present in Xamarin.iOS, then what is the way around. Have Xamarin iOS designer has handled this some way other?
Waiting for any hint or positive reply.
Thanks

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