I reproduced your scenario locally. Please make sure that you have added references to the following assemblies in your project, because you do not mention adding them - you have mentioned only 'Telerik.Windows.Controls.ScheduleView.dll'.
Further, please also make sure that you are writing the 'using' directive in the Main.xaml.cs file, not in 'Main.g.i.cs'.
I hope this helps.
All the best,
the Telerik team
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